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This list of the Mesozoic life of Texas contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Texas and are between 252.17 and 66 million years of age. A{{Compact ToC}}- †Acanthoceras
- †Acanthoceras adkinsi
- †Acanthoceras amphibolum
- †Acanthoceras barcusi
- †Acanthoceras eulessanum
- †Acanthoceras johnsonanum
- †Acanthoceras tarrantense
- †Acanthoceras tarrantense nitidum
- †Acanthoceras wintoni
- †Acanthoceras worthense
- Acesta
- †Acesta sayeri
- †Acesta sayrei
- Acila
- Acirsa
- †Acirsa flexicostata – tentative report
- Acmaea
- †Acmaea occidentalis
- †Acmaea pilleolus
- †Acompsoceras
- †Acrocanthosaurus
- †Acrocanthosaurus atokensis
- †Acrosmilia
- Acteon
- †Acteon nitidus – tentative report
- †Acteon throckmortoni
- †Acteonella
- †Acteonella delgadoi
- †Acteonella pecosensis
- †Acteonella sublaevis – or unidentified comparable form
- †Actinacis
- †Actinacis valverdensis – type locality for species
- †Actinastrea
- †Actinostreon
- †Acutostrea
- †Adelobasileus – type locality for genus
- †Adelobasileus cromptoni – type locality for species
- †Adinodon
- †Adinodon pattersoni – type locality for species
- †Adkinsella – type locality for genus
- †Adkinsella edwardsensis – type locality for species
- †Adkinsia
- †Adkinsia bosquensis – type locality for species
- †Adkinsia knikerae – type locality for species
- †Adocus
- †Aenona
- †Aetodactylus – type locality for genus
- †Aetodactylus halli – type locality for species
- †Agerostrea
- †Aguileria
- {{multiple image
| total_width = 248 | image1 = Agujaceratops BW.jpg | alt1 = | image2 = Alamosaurus Scale Chart Steveoc.svg | alt2 = | footer = Left: Life restoration of the Late Cretaceous horned dinosaur Agujaceratops. Right: Diagram illustrating the sizes of three specimens of the Late Cretaceous long-necked dinosaur Alamosaurus, with an anachronistic human to scale.}} †Agujaceratops - †Agujaceratops mariscalensis – type locality for species
- †Akera
- †Alamosaurus
- †Alamosaurus sanjuanensis
- †Albanerpeton
- †Albanerpeton arthridion – type locality for species
- †Albanerpeton gracilis
- †Albanerpeton nexuosus
- †Aliofusus
- †Aliofusus balaniformis
- †Aliofusus reagani
- †Aliofusus reagani subtilis
- †Aliofusus reagani tumidus
- †Aliomactra
- †Alkaidia – type locality for genus
- †Alkaidia sumralli – type locality for species
- {{multiple image
| total_width = 248 | image1 = Allocrioceras pariense.jpg | alt1 = | image2 = Alphadon sp. - MUSE.jpg | alt2 = | footer = Left: Fossilized shell of the Late Cretaceous ammonoid cephalopod Allocrioceras. Right: Restorative model of the Late Cretaceous mammal Alphadon.}} †Allocrioceras - †Allocrioceras annulatum
- †Allocrioceras dentonense
- †Allocrioceras larvatum
- Alnus
- †Alphadon
- †Alphadon halleyi – or unidentified comparable form
- †Alphadon perexiguus – type locality for species
- †Altairia – type locality for genus
- †Amaurellina
- †Ambigostrea
- †Ambrosea
- Ammobaculites
- †Ammobaculites subcretaceous
- †Ammobaculites subcretaceus
- {{multiple image
| total_width = 248 | image1 = Gastropoda - Ampullina sp.JPG | alt1 = | image2 = Pectinidae - Amusium cristatum.JPG | alt2 = | footer = Left: Fossilized shell of the Jurassic-Miocene sea snail Ampullina. Right: Fossilized shell of the Carboniferous-modern scallop Amusium.}} †Ampullina – or unidentified comparable form - †Ampullina abnormalis
- †Ampullina densatus
- †Ampullina lirata
- Amuletum
- †Amuletum boylei
- †Amuletum curvocostatum
- †Amuletum venustum
- Amusium
- †Amusium danei – tentative report
- †Anacolosidites
- †Anaklinoceras
- †Anatimya
- †Anatimya anteradiata
- †Anatimya anteradiata texana
- †Anatimya eulessana
- †Anatimya longula
- †Anchura
- †Anchura bexarensis
- †Anchura caddoensis
- †Anchura campbelli
- †Anchura elegans
- †Anchura hoggi
- †Anchura lamari
- †Anchura modesta
- †Anchura noackensis
- †Anchura noakensis – tentative report
- †Anchura substriata
- †Anchura turricula
- †Anchura whitneyensis
- †Ancilla
- {{multiple image
| total_width = 248 | image1 = Angistorhinus grandis.jpg | alt1 = | image2 = Angulomastacator skull.png | alt2 = | footer = Left: Life restoration of the Late Triassic phytosaur Angistorhinus. Right: Reconstructive illustration of a fossilized skull of the Late Cretaceous duck-billed dinosaur Angulomastacator.}} †Angistorhinus - †Angistorhinus alticephalus – type locality for species
- †Angistorhinus grandis
- †Angulomastacator – type locality for genus
- †Angulomastacator daviesi – type locality for species
- †Anisoceras
- †Anisoceras armatum
- †Anisoceras perarmatum
- †Anisomyon
- †Anisomyon borealis – tentative report
- †Anisomyon haydeni
- †Anomalina
- †Anomalina petita
- †Anomalina torcerensis
- †Anomalofusus
- †Anomalofusus bellulus
- †Anomalofusus lemniscatus
- Anomia
- †Anomia argentaria
- †Anomia mexicana
- †Anomia ornata
- †Anomia ponticulana
- †Anomia tellinoides
- †Anomoeodus
- †Anomotodon
- †Anomotodon toddi – type locality for species
- †Antillocaprina
- †Apachesaurus
- †Aphrodina
- †Aphrodina navarroana
- †Aphrodina tippana
- Aplousina
- †Apsgnathus – type locality for genus
- †Apsgnathus triptodon – type locality for species
- Arca
- †Arca martindalensis
- †Arca pergracilis
- †Arca rostellata
- †Arca securiculata
- Architectonica
- †Architectonica voragiformis
- Arcopsis
- †Arctostrea
- †Areopsammia – type locality for genus
- †Areopsammia bakerae – type locality for species
- †Arganodus
- †Arganodus dorotheae – type locality for species
- Arrhoges
- †Arrhoges cibolensis
- †Arrhoges ciboloensis
- †Arrhoges lobata media
- †Arrhoges plenocosta
- †Asciocythere
- {{multiple image
| total_width = 248 | image1 = Aspidoceras 1.JPG | alt1 = | image2 = Astrangia gross view.png | alt2 = | footer = Left: Fossilized shell of the Late Jurassic-Early Cretaceous ammonoid cephalopod Aspidoceras. Right: An Astrangia stony coral.}} †Aspidoceras - †Astacodes
- †Astacodes davisi
- †Astacodes maxwelli
- †Astandes
- Astarte
- †Astarte culebrensis
- †Astarte malonensis
- †Astartemya
- †Astartemya fentressensis
- Astrangia
- †Astrangia cretacea
- †Astrangia lamarensis – type locality for species
- Astreopora – tentative report
- †Astreopora leightoni – type locality for species
- †Astrocoenia
- †Astrocoenia budaensis – type locality for species
- †Astrocoenia nidiformis
- †Astrocoenia scyphoidea – type locality for species
- †Astroconodon – type locality for genus
- †Astroconodon denisoni – type locality for species
- †Astrocratis – type locality for genus
- †Astrocratis acutispina – type locality for species
- †Astrodon
- †Astrophocaudia – type locality for genus
- †Astrophocaudia slaughteri – type locality for species
- †Atreta
- †Aulastraeopora – type locality for genus
- †Aulastraeopora harrisi – type locality for species
- †Axonoceras
- †Axonoceras compressum
- †Axonoceras multicostatum
- †Axonoceras multicostatum rotundum
- †Axonoceras pingue
- †Axosmilia
- †Axosmilia craginiana – type locality for species
- †Axosmilia whitneyi – type locality for species
B{{Compact ToC}}- †Baculites
- †Baculites aquilaensis - or unidentified loosely related form
- †Baculites claviformis
- †Baculites haresi – or unidentified comparable form
- †Baculites ovatus
- †Baculites scotti
- †Baculites taylorensis
- †Baculites tippahensis
- †Baculites undatus
- †Baena – report made of unidentified related form or using admittedly obsolete nomenclature
- †Banis
- Barbatia – tentative report
- †Barroisiceras
- {{multiple image
| total_width = 248 | image1 = Basilemys.jpg | alt1 = | image2 = Belemnitella mucronata.jpg | alt2 = | footer = Left: Mounted fossilized skeleton of the Cretaceous turtle Basilemys. Right: Fossilized guard of the Late Cretaceous belemnoid cephalopod Belemnitella.}} †Basilemys - †Bathycyathus – tentative report
- †Bathycyathus lloydi – type locality for species
- †Bathytormus
- †Belemnitella
- †Bellifusus
- †Bellifusus angulicostatus – or unidentified related form
- †Bellifusus buffaloensis
- †Bellifusus coronatus
- †Bellifusus crassicostatus
- †Bellifusus deatsvillensis
- †Bellifusus multicostatus
- †Bellifusus robustus
- †Bellifusus tennistriatus
- †Belliscala
- †Belliscala crideri
- †Belliscala forbeyi
- †Belliscala rockensis
- †Belodon
- †Belodon superciliosus – type locality for species
- †Belonostomus
- †Beretra
- †Beretra contracta
- †Beretra elongata
- †Beretra firma
- †Beretra ornatula
- †Beretra ripleyana
- †Beretra striata
- {{multiple image
| total_width = 330 | image1 = Bernissartia_BW.jpg | alt1 = | image2 = Betelgeusia orientalis MHNT.PAL.2010.2.1.jpg | alt2 = | image3 = Bostrychoceras polyplocum 01.JPG | alt3 = | footer = Left: Life restoration of the Early Cretaceous crocodilian relative Bernissartia. Middle: Fossils of the Middle Jurassic-Cretaceous sea star Betelgeusia. Right: Fossilized shell of the Late Cretaceous ammonoid cephalopod Bostrychoceras.}} †Bernissartia – tentative report - †Betelgeusia – type locality for genus
- †Betelgeusia reidi – type locality for species
- †Borissiakoceras
- †Borissiakoceras orbiculatum
- †Bostrychoceras
- †Bostrychoceras polyplocum
- Botula
- †Botula carolinensis
- †Botula conchafodentis
- †Botula plumosa
- †Brachauchenius
- Brachidontes
- †Brachidontes arlingtonanus
- †Brachidontes filisculptus
- †Brachidontes filisculptus microcostae
- †Brachidontes fulpensis
- Brachiodontes
- †Brachychampsa
- †Brachycythere – tentative report
- †Brachycythere subconcentrica
- †Brachyrhizodus – type locality for genus
- †Brachyrhizodus wichitaensis – type locality for species
- {{multiple image
| total_width = 248 | image1 = Exhibit Museum of Natural History, Ann Arbor - IMG 9131.JPG | alt1 = | image2 = Bravoceratops NT small.jpg | alt2 = | footer = Left: Fossilized skull of the Late Triassic phytosaur Brachysuchus. Right: Life restoration of the Late Cretaceous horned dinosaur Bravoceratops.}} †Brachysuchus – type locality for genus - †Brachysuchus megalodon – type locality for species
- †Bravoceratops – type locality for genus
- †Bravoceratops polyphemus – type locality for species
- †Breviarca
- †Breviarca grandis
- †Breviarca habita
- †Breviarca minor
- †Breviarca nolani
- †Breviarca plummeri
- †Brontopodus – type locality for genus
- †Brontopodus birdi – type locality for species
- †Buccinopsis
- †Buccinopsis crassa
- †Buccinopsis crassicostata
- †Buccinopsis crassus
- †Buccinopsis globosa
- †Buccinopsis greenensis
- †Buccinopsis perryi
- †Buccinopsis solida
- †Budaia – type locality for genus
- †Budaia travisensis – type locality for species
- †Budaiceras
- †Budaiceras alticarinatum
- †Budaiceras elegantior
- †Budaiceras hyatti
- †Burckhardtites
- †Burckhardtites palmensis
- Busycon – tentative report
C{{Compact ToC}}- Cadulus
- †Cadulus coonensis
- †Cadulus obnutus
- †Cadulus praetenuis
- Caestocorbula
- †Caestocorbula crassaplica
- †Caestocorbula crassiplica
- †Caestocorbula suffalciata
- †Caestocorbula terramaria
- †Caestocorbula torta
- †Caestocorbula williardi
- Callianassa
- †Calliomphalus
- †Calliomphalus americanus
- †Calliomphalus bellulus
- †Calliomphalus microcancelli
- Callistina
- †Callistina alta
- †Callistina lamarensis
- †Callistina munda
- †Callistina taffi
- †Callodus – type locality for genus
- †Callodus coronatus – type locality for species
- Callucina
- †Callucina chatfieldana
- †Callucina oleodorsum
- †Callucina seminalis
- †Calyptosuchus – type locality for genus
- †Calyptosuchus wellesi – type locality for species
- Calyptraea
- †Camptonectes
- †Camptonectes bellisculptus
- †Camptonectes bubonis
- †Camptonectes burlingtonensis
- †Camptonectes cavanus
- †Camptonectes ellsworthensis
- †Camptonectes kaufmanensis
- †Camptonectes martinsensis
- Cancellaria
- †Cancellaria matroni – tentative report
- †Cantabrigites
- †Cantabrigites spinosum
- †Cantabrigites subsimplex – or unidentified related form
- Cantharus – tentative report
- †Cantioscyllium
- †Cantioscyllium meyeri – type locality for species
- †Capellia – type locality for genus
- †Capellia mauricei – type locality for species
- †Caprina
- †Caprina coraloidea
- †Caprina douvillei
- †Caprinuloidea
- †Caprinuloidea multitubifera
- †Caprinuloidea perfecta
- Capulus
- †Capulus cuthandensis
- †Capulus erectus
- †Capulus microstriatus – tentative report
- †Capulus spangleri
- Carcharias
- †Carcharias heathi – type locality for species
- †Carcharias holmdelensis
- †Carcharias samhammeri – or unidentified comparable form
- †Cardiaster
- Cardium
- †Caririchnium
- †Caririchnium protohadrosaurichnos – type locality for species
- Carota
- †Carota biplicata
- †Carota pendula
- †Carota robusta
- †Carycorbula
- Caryocorbula
- †Caryocorbula ovisana
- †Caryocorbula tradingensis
- †Caryocorbula varia
- Caryophyllia
- †Caryophyllia comanchei – type locality for species
- †Caryophyllia dentonensis – type locality for species
- †Caryophyllia konincki – type locality for species
- †Caseosaurus – type locality for genus
- †Caseosaurus crosbyensis – type locality for species
- †Casierius
- †Casierius heckeli
- †Casierius heckelii
- †Catactegenys – type locality for genus
- †Catactegenys solaster – type locality for species
- †Catastomocystis
- †Caturus
- †Caveola
- †Caveola acuta – tentative report
- †Caveola bellsana
- †Caveola producta
- †Cedarosaurus
- †Cenomanocarcinus
- †Cenomanocarcinus refroae
- †Cenomanocarcinus renfroae
- †Cenomanocarcinus vanstraeleni
- †Ceratodus
- †Ceratodus americanus – or unidentified comparable form
- Ceratotrochus – tentative report
- †Ceriopora
- Cerithiella
- †Cerithiella nodoliratum – or unidentified related form
- †Cerithiella semirugatum
- Cerithium
- †Chamops
- {{multiple image
| total_width = 330 | image1 = Champsosaurus BW.jpg | alt1 = | image2 = Chindesaurus bryansmalli.png | alt2 = | image3 = Chinlea BW.jpg | alt3 = | footer = Left: Life restoration of the Late Cretaceous-Eocene choristoderan reptile Champsosaurus. Middle: Life restoration of the Late Triassic theropod dinosaur Chindesaurus. Right: Life restoration of the Late Triassic coelacanth fish Chinlea.}} †Champsosaurus - †Chartecytis
- †Cheloniceras
- †Cheloniceras adkinsi
- †Cheloniceras cornuelianum
- †Chindesaurus
- †Chindesaurus bryansmalli
- †Chinlea
- †Chirostenotes
- †Chondrodonta
- †Chondrodonta glabra
- †Chondrodonta munsoni
- †Chondrodonta youngi – type locality for species
- {{multiple image
| total_width = 330 | image1 = Chupacabrachelys complexus.jpg | alt1 = | image2 = OrnitocheiridsDB.jpg | alt2 = | image3 = Ptilodus.jpg | alt3 = | footer = Left: Life restoration of the Late Cretaceous turtle Chupacabrachelys. Middle: Life restoration of the Late Cretaceous pterosaur Cimoliopterus (left) stealing fish from another pterosaur. Right: Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys.}} †Chupacabrachelys – type locality for genus - †Chupacabrachelys complexus – type locality for species
- Cidaris
- †Cidaris hemigranosus
- †Cidaris texanus
- †Cimexomys
- †Cimoliasaurus
- †Cimoliopterus
- †Cimoliopterus dunni – type locality for species
- †Cimolodon
- †Cimolodon electus – or unidentified comparable form
- †Cimolomys
- †Cinulia
- †Cinulia tarrantensis – or unidentified related form
- †Cionichthys
- †Cionichthys greeni – type locality for species
- †Citharina
- †Cladoceramus
- †Cladoceramus undulatoplicatus
- †Cladophyllia
- †Clavipholas
- †Clavipholas pectorosa
- †Clavipholas whitfieldi
- †Clevosaurus – or unidentified comparable form
- †Clidastes
- Cliona
- †Cliona microtuberum
- †Cliona retiformis
- †Clisocolus
- †Coahomasuchus – type locality for genus
- †Coahomasuchus kahleorum – type locality for species
- †Coahuilites – tentative report
- †Coalcomana
- †Codiopsis
- †Codiopsis stephensoni – type locality for species
- {{multiple image
| total_width = 248 | image1 = 9178 - Milano - Museo storia naturale - Coelodus costai - Foto Giovanni Dall'Orto 22-Apr-2007.jpg | alt1 = | image2 = Coelophysis size.jpg | alt2 = | footer = Left: Fossilized skeleton of the Middle Triassic-Paleocene bony fish Coelodus. Right: Life restoration of the Late Triassic-Early Jurassic theropod dinosaur Coelophysis with an anachronistic human to scale.}} †Coelodus - †Coelodus decaturensis – type locality for species
- †Coelodus fabadens – type locality for species
- †Coelophysis
- †Coelosmilia
- †Coelosmilia americana
- †Coelosmilia texana
- †Coilopoceras
- †Collignoniceras
- †Collignoniceras woollgari
- †Colognathus – type locality for genus
- †Colognathus obscurus – type locality for species
- †Colombiceras
- †Columbiceras
- †Comptoniaster
- †Confusiscala – tentative report
- †Coniasaurus
- †Connectastrea – tentative report
- †Connectastrea infundibuliformis – type locality for species
- Conopeum
- †Continuoolithus
- {{multiple image
| total_width = 248 | image1 = Ruhrmuseum-Ebene-12-Naturkunde3784.jpg | alt1 = | image2 = Corbula modesta 002.jpg | alt2 = | footer = Left: Fossils of the Cretaceous sea urchin Conulus. Right: Shell of a Corbula basket clam.}} †Conulus - †Conulus stephensoni – type locality for species
- Corbicula
- Corbula
- †Corbula amniculana
- †Corbula dentonensis
- †Corbula inflata
- †Corbula linteroidea
- †Corbula ponsana
- †Corbula pulvinata
- †Corbula rockensis
- †Corbula senecta
- †Corbula starana
- †Corbula subradiata
- †Corbula subradiata texana
- †Corbula torta – or unidentified related form
- †Corbula williardi – tentative report
- †Corbula woodi
- †Coskinolinoides
- †Costellacesta
- †Coupatezia
- †Coupatezia turneri – type locality for species
- †Craginia
- Crassatella
- †Crassatella hodgei
- †Crassatella quinlanensis
- †Crassatella vadosa
- †Crassatella vadosa bexarensis
- †Crassatella vadosa cedarensis
- †Crassatella vadosa chatfieldensis
- †Crassatella vadosa manorensis
- Crassostrea
- †Crassostrea cortex
- †Crassostrea cusseta
- †Crassostrea trigonalis
- †Crateraster
- †Crateraster quinqueloba
- †Crateraster texensis
- †Crenella
- †Crenella elegantula
- †Crenella serica
- †Crenella subcircularis
- †Creonella
- †Creonella deusseni
- †Creonella triplicata
- †Creonella whitei
- †Cretacoranina
- {{multiple image
| total_width = 330 | image1 = Cretolamna.jpg | alt1 = | image2 = Crosbysaurus hypothetical.png | alt2 = | image3 = Cucullaea labiata 3.JPG | alt3 = | footer = Left: Fossil of the Early Cretaceous-Eocene shark Cretolamna. Middle: Extremely hypothetical life restoration of the mysterious Late Triassic reptile Crosbysaurus. Right: Shell of a Cucullaea, or false ark shell.}} †Cretolamna - †Cretolamna appendiculata
- †Cretolamna maroccana
- †Cretorectolobus
- †Cretorectolobus olsoni – or unidentified comparable form
- †Crosbysaurus – type locality for genus
- †Crosbysaurus harrisae – type locality for species
- Ctena
- Cucullaea
- †Cucullaea blanpiedi
- †Cucullaea capax
- †Cucullaea deatvillensis
- †Cucullaea kingsensis
- †Cucullaea murrayi
- †Cucullaea powersi
- †Cuna
- †Curtocaprina – type locality for genus
- †Curtocaprina clabaughikinsorum – type locality for species
- Cuspidaria
- †Cuspidaria alaeformis
- †Cuspidaria ampulla
- †Cuspidaria grandis
- †Cuspidaria grovensis
- †Cyathomorpha – tentative report
- †Cyathomorpha damoni – type locality for species
- †Cyathophora
- †Cyathophora haysensis – type locality for species
- †Cyathophora olssoni – type locality for species
- †Cyclorisma
- †Cyclorisma orbiculata
- †Cyclorisma parva
- †Cyclorisma pumila
- †Cyclothyris
- Cylichna
- †Cylichna incisa
- †Cylichna secalina
- †Cymatoceras
- †Cymatoceras hilli – or unidentified comparable form
- †Cymatoceras texanum
- †Cymbophora
- †Cymbophora appressa
- †Cymbophora berryi
- †Cymbophora cancellosa
- †Cymbophora inflata
- †Cymbophora puteana
- †Cymbophora saccellana
- †Cymbophora scabellum
- †Cymbophora schucherti
- †Cymbophora securis
- †Cymbophora simpsonensis
- †Cymbophora spooneri
- †Cymbophora subtilis
- †Cymbophora wordeni
- †Cymella
- †Cymella bella
- †Cymella bella texana
- †Cymella ironensis
- †Cypridae
- †Cypridae wyomingensis – or unidentified related form
- †Cyprimeria
- †Cyprimeria alta
- †Cyprimeria coonensis
- †Cyprimeria depressa
- †Cyprimeria patella
- Cythere
- †Cythereis
- †Cythereis dentonensis
- †Cythereis hawleyi
- †Cythereis nuda
- †Cythereis ornatissima
- †Cythereis paupera
- †Cythereis pustulosissima
- †Cythereis worthensis
- Cytherella
- Cytherelloidea
- †Cytherelloidea reticulata
- †Cytherelloidea williamsoniana
- Cytheropteron
- †Cytheropteron rugosalatum
- Cyzicus – tentative report
D{{Compact ToC}}- †Dallasaurus – type locality for genus
- †Dallasaurus turneri – type locality for species
- †Darwinula
- Dasmosmilia
- †Dasmosmilia kochii – type locality for species
- Dasyatis
- †Dasyatis commercensis – type locality for species
- †Dathmila
- †Dawsonius
- †Deinosuchus
- †Deinosuchus riograndensis
- †Deinosuchus rugosus – type locality for species
- †Deltaichthys
- †Dendrosmilia – tentative report
- †Denebia – type locality for genus
- Dentalina
- Dentalium
- †Dentalium inornatum
- †Dentalium leve
- †Dentalium minor
- †Dentalium navarroi
- †Dentalium pauperculum
- †Dentalium sublineatum
- †Dentalium vaughani
- †Dentonia
- {{multiple image
| total_width = 248 | image1 = Desmatosuchus spurensis.jpg | alt1 = | image2 = Gasteropods - Ammonites - Desmoceras sp..JPG | alt2 = | footer = Left: Life restoration of the Late Triassic aetosaur Desmatosuchus with an anachronistic human to scale. Right: Fossilized shells of the Early Cretaceous ammonoid cephalopod Desmoceras.}} †Desmatosuchus - †Desmatosuchus haplocerus
- †Desmatosuchus smalli – type locality for species
- †Desmatosuchus spurensis – type locality for species
- †Desmoceras
- †Deussenia
- †Deussenia bellalirata
- †Deussenia ciboloensis
- †Deussenia corbis
- †Deussenia multilirae
- †Deussenia travisana
- †Dhondtichlamys
- †Dichastopollenites
- †Dictyoconus
- †Dimorpharaea
- †Dimorpharaea manchacaensis – type locality for species
- †Dimorphastrea
- †Dimorphastrea stantoni – type locality for species
- †Dinogymnium
- †Dinogymnium acuminatum
- †Dinogymnium euclaense
- Diodora – tentative report
- †Diphydontosaurus – or unidentified related form
- †Diploastrea
- †Diploastrea harrisi – type locality for species
- †Diploastrea hilli – type locality for species
- †Diploastrea vaughani – type locality for species
- †Diplolonchidion – type locality for genus
- †Diplolonchidion murryi – type locality for species
- †Diplomoceras
- †Discofascigera
- Discorbis
- †Discorbis correcta
- †Discorbis minima
- †Discoscaphites
- †Discoscaphites conradi
- †Discoscaphites erucoideus
- †Distefanella – or unidentified comparable form
- {{multiple image
| total_width = 330 | image1 = Dolichorhynchops.jpg | alt1 = | image2 = Doswellia BW.jpg | alt2 = | image3 = Gasteropods - Ammonites - Douvilleiceras sp..JPG | alt3 = | footer = Left: Mounted fossilized skeleton of the Late Cretaceous plesiosaur Dolichorhynchops. Middle: Life restoration of the Late Triassic reptile Doswellia. Right: Fossilized shell of the Early-Late Cretaceous ammonoid cephalopod Douvilleiceras.}} †Dolichorhynchops - †Dolichorhynchops bonneri
- †Doswellia
- †Douvilleiceras
- †Douvilleiceras grandense
- †Douvilleiceras mammillatum
- †Douvilleiceras offarcinatum – or unidentified comparable form
- †Douvilleiceras orbignyi – or unidentified comparable form
- †Douvilleiceras quitmanense
- †Douvilleiceras rex
- †Douvilleiceras spathi
- †Douvillelia – tentative report
- †Dreissena
- †Drepanocheilus
- †Drepanocheilus corbetensis
- †Drepanocheilus cuthandensis
- †Drepanocheilus texanus
- †Drepanochilus
- †Drepanochilus corbetensis
- †Drepanochilus davidsi
- †Drepanochilus martini
- †Drepanochilus texanus
- †Drepanochilus triliratus
- †Drilluta
- †Drilluta brevispira
- †Drilluta crassicostata
- †Drilluta crassicostata longa
- †Drilluta distans
- †Drilluta major – or unidentified comparable form
- †Drilluta paucicostata
- †Dromomeron
- †Dromomeron gregorii – type locality for species
- †Dryptosaurus
- †Dufrenoyia
- †Dufrenoyia justinae
- †Dufrenoyia rebeccae
- †Durania
E{{Compact ToC}}- †Echinocorys
- †Ecoacteon
- †Ecphora
- †Ecphora proquadricostata
- {{multiple image
| total_width = 248 | image1 = Ectenosaurus clidastoides skeleton.png | alt1 = | image2 = Edmontonia dinosaur.png | alt2 = | footer = Left: Fossilized partial skeleton of the Late Cretaceous mosasaur Ectenosaurus. Right: Life restoration of the Late Cretaceous armored dinosaur Edmontonia.}} †Ectenosaurus - †Edmontonia – or unidentified comparable form
- †Elea – tentative report
- †Elephantaria
- †Elephantaria simondsi – type locality for species
- †Ellipsoscapha
- †Ellipsoscapha mortoni
- †Ellipsoscapha striatella
- †Enchodus
- †Endoplocytia
- †Endoptygma
- †Endostoma
- †Endostoma mexicana – or unidentified comparable form
- †Engonoceras
- †Engonoceras complicatum
- †Engonoceras elegans
- †Engonoceras gibbosum
- †Engonoceras hilli
- †Engonoceras retardum
- †Engonoceras serpentinum
- †Engonoceras stolleyi
- †Engonoceras subjectum – or unidentified related form
- †Enoploclytia
- †Enoploclytia triglypta
- †Enoploclytia wintoni
- †Entolium
- †Eoacteon
- †Eodouvilleiceras
- †Eomunidopsis
- Eonavicula
- †Eonavicula newspecies1
- †Eonavicula rostellata
- †Eoradiolites
- †Eosiderastrea
- †Eosiderastrea cuyleri – type locality for species
- †Eoursivivas
- †Epiaster
- †Epiphaxum
- †Epiphaxum labyrinthicum – type locality for species
- †Episcoposaurus – type locality for genus
- †Episcoposaurus haplocerus – type locality for species
- †Epistomina
- †Epistomina charlottae
- †Epistomina lacunosa
- †Epistreptophyllum
- †Epistreptophyllum boesei – type locality for species
- †Epistreptophyllum budaensis – type locality for species
- †Epistreptophyllum shumardi – type locality for species
- †Epitonium
- †Etea
- †Etea corsicana
- †Etea peasi
- †Ethmocardium
- †Eubaculites
- {{multiple image
| total_width = 248 | image1 = Eubostrychoceras japonicum.jpg | alt1 = | image2 = Acanthoceratidae - Eucalycoceras pentagonus.JPG | alt2 = | footer = Left: Fossilized shell of the Late Cretaceous ammonoid cephalopod Eubostrychoceras. Right: Fossilized shell of the ammonoid cephalopod Eucalycoceras.}} †Eubostrychoceras - †Eubostrychoceras reevesi
- †Eucalycoceras
- †Eucalycoceras templetonense – type locality for species
- †Eufistulana
- †Eufistulina
- †Eugyra
- †Eugyra cuyleri – type locality for species
- †Euhoplites – tentative report
- †Eulima
- †Eulima clara
- †Eulima laevigata
- †Euomphaloceras
- †Euomphaloceras alvaradoense
- †Euomphaloceras lonsdalei
- †Euomphaloceras septemseriatum
- †Eupachydiscus
- †Eupachydiscus grossouvrei
- †Euspira
- †Euspira dorothiensis
- †Euspira dorothiensis pendula
- †Euspira rectilabrum
- †Euspira rectilabrum texanus
- †Euspira rivulana
- Euthriofusus – or unidentified related form
- {{multiple image
| total_width = 248 | image1 = Eutrephoceras dekayi - Coon Creek Tennessee.jpg | alt1 = | image2 = Exogyra costata Prairie Bluff Fm Maastrichtian.JPG | alt2 = | footer = Left: Illustration in multiple views of a fossilized shell of the Late Jurassic-Miocene nautiloid cephalopod Eutrephoceras. Right: Fossilized shell of the Jurassic-Cretaceous foam oyster Exogyra.}} †Eutrephoceras - †Eutrephoceras dekayi
- †Eutrephoceras perlatus
- †Eutrephoceras planoventer
- †Ewingia – type locality for genus
- †Ewingia problematica – type locality for species
- †Exogyra
- †Exogyra americana
- †Exogyra arientina
- †Exogyra cancellata
- †Exogyra columbella
- †Exogyra columbella levis
- †Exogyra costata
- †Exogyra costata spinifera
- †Exogyra erraticostata
- †Exogyra potosina
- †Exogyra spinifera
- †Exogyra texana
F{{Compact ToC}} | total_width = 248 | image1 = Fagesia spheroidalis.jpg | alt1 = | image2 = Favia species 4.jpg | alt2 = | footer = Left: Fossilized shell of the Late Cretaceous ammonoid cephalopod Fagesia. Right: Living Favia stony coral.}} †Fagesia - †Faraudiella
- †Faraudiella franciscoensis
- †Faraudiella roermeri
- †Faujasia
- †Faujasia chelonium – type locality for species
- †Favia
- †Feldmannia
- †Ficheuria
- †Ficheuria pernoni – or unidentified related form
- †Fictoacteon
- †Fictoacteon alveolanus
- †Fictoacteon humilispira
- †Fictoacteon imlayi
- †Fictoacteon saxanus
- Filisparsa
- †Flaventia
- †Flemingostrea
- †Flemingostrea pratti
- †Flemingostrea subspatula
- †Flemingostrea subspatulata
- †Flexomornis – type locality for genus
- †Flexomornis howei – type locality for species
- †Flickia
- †Flickia simplex – type locality for species
- †Fomalhautia – type locality for genus
- †Fomalhautia hortensae – type locality for species
- †Forbesiceras
- †Forbesiceras beaumontianum
- †Forbesiceras brundrettei
- †Forbesiceras conlini
- †Forresteria
- †Forresteria castellense – type locality for species
- †Forresteria forresteri – type locality for species
- †Forresteria sevierense – type locality for species
- †Frenelopsis
- †Fulgerca
- †Fulgerca attenuata – or unidentified related form
- †Fulgerca venusta
- †Fulpia
- †Fungella
- †Fuscinapedis – type locality for genus
- †Fuscinapedis woodbinensis – type locality for species
- †Fusimilis
- Fusinus
- †Fusinus cornelianus
- †Fusinus macnairyensis – or unidentified related form
G{{Compact ToC}}- Galeorhinus
- †Galeorhinus girardoti – or unidentified related form
- †Gallolestes
- †Gallolestes agujaensis – type locality for species
- †Garramites
- Gastrochaena
- Gaudryina
- †Gaudryina austinana
- †Gaudryina cushmani
- †Gaudryina ellisorae
- Gegania
- †Geltena
- †Geltena nitida
- †Geltena obesa
- †Geltena prunoides
- †Geltena subcompressa
- †Geltena subequilatera
- †Geltena sybcompressa
- †Gerdalia
- †Gervillia
- †Gervillia bryani
- †Gervillia wellsi – tentative report
- †Gervilliopsis
- †Gervilliopsis ensiformis
- †Gervilliopsis ensiformis extensa
- †Gervilliopsis invaginata
- Ginglymostoma
- †Glenrosa
- †Glenrosa pagiophylloides
- †Glenrosa texensis
- †Globator
- †Globator vaughani – type locality for species
- †Globidens
- Globigerina
- †Globigerina cretacea
- †Globigerina washitaensis
- Glossus
- †Glossus bulbosa
- †Glossus hendersoni
- †Glossus irelandi
- †Glossus shumardi
- †Glossus slatana
- †Glossus slatana parva
- Glycymeris
- †Glycymeris rotundata
- †Glycymeris rotundata kaufmanensis
- †Glyptops – tentative report
- †Glyptoxoceras
- †Gobiates
- †Goniochasma
- †Goniocylichna
- †Goniophorus
- †Graciliala
- †Graciliala calcaris
- †Graciliala cooki
- †Graciliala johnsoni – tentative report
- †Grammatodon
- †Grammatodon adkinsi
- †Grammatodon bowiei
- †Granocardium
- †Granocardium bowenae
- †Granocardium conradi
- †Granocardium deltanum
- †Granocardium dumosum
- †Granocardium kuemmeli
- †Granocardium kummeli
- †Granocardium lowei
- †Granocardium rossae
- †Granocardium tholi
- †Granocardium tippananum
- †Graphidula
- †Graphidula gabrielensis – tentative report
- †Graphidula hoggi
- †Graphidula lynnensis
- †Graphidula multicostata
- †Graphidula terebriformis
- †Graptocarcinus
- †Graysonia
- †Graysonites
- †Graysonites adkinsi
- †Graysonites wacoense
- †Gryphaea
- †Gryphaea aucella – or unidentified related form
- †Gryphaea gibberosa
- †Gryphaea marcoui
- †Gryphaea pitcheri
- †Gryphaea washitaensis
- †Gryphaeostrea
- †Gryposaurus – tentative report
- †Guembelina
- †Guembelina globulosa
- †Guembelina paucistriata
- †Gumbelina
- †Gymnentome
- †Gymnentome valida
- †Gymnentome valida brevis
- †Gypsichnites
- †Gypsichnites titanopelopatidus
- Gyrodes
- †Gyrodes abyssinus
- †Gyrodes americanus
- †Gyrodes major
- †Gyrodes petrosus
- †Gyrodes rotundus
- †Gyrodes spillmani
- †Gyrodes subcarinatus
- †Gyrodes supraplicatus
- †Gyrodes tramitensis
- †Gyronchus
- †Gyrostrea
H{{Compact ToC}}- Haminoea – tentative report
- †Hamites
- †Hamrabatis
- †Hamrabatis weltoni – type locality for species
- †Hamulus
- †Hamulus huntensis
- †Hamulus onyx
- †Hamulus squamosus
- †Haplostiche
- †Haplovoluta
- †Harduinia
- †Harduinia bexari
- †Harduinia dalli
- †Harduinia mortonis
- †Helicoceras
- †Helopanoplia
- Hemiaster
- †Hemiaster benhurensis
- †Hemiaster bexari
- †Hemiaster jacksoni
- †Hemiaster sabinal – type locality for species
- †Hemiaster texanus
- †Hemiaster wetherbyi
- †Hemicalypterus – tentative report
- Hemicerithium
- †Hemicerithium insigne
- †Hemicerithium interlineatum
- †Hercorhynchus
- †Hercorhynchus malleiformis
- †Hercorhyncus
- †Hercorhyncus coronale
- †Hercorhyncus malleiformis
- †Hercorhyncus mundum
- †Hercorhyncus nodosum
- †Hercorhyncus tippanus
- †Hercorhyncus vadosum
- †Heterocoenia – tentative report
- †Heterocoenia hilli – type locality for species
- †Heterocoenia washitaensis – type locality for species
- Heterodontus
- †Heterodontus granti – type locality for species
- † Heteromorpha
- Hexanchus
- †Hillites
- †Hillites multilirae
- †Hillites septarianus
- †Hindeastraea
- †Holaster
- †Holoclemensia – type locality for genus
- †Holoclemensia texana – type locality for species
- Homarus
- †Homarus brittonetris
- †Homarus davisi
- †Homarus travisensis
- †Homoeosolen
- †Homomya
- †Homomya thrusheri – tentative report
- †Hoplochelys
- {{multiple image
| total_width = 330 | image1 = Hoploscaphites ammonite.jpg | alt1 = | image2 = Hybodus NT.jpg | alt2 = | image3 = Hydnophora exesa, Lizard.jpeg | alt3 = | footer = Left: Fossilized shell of the Late Cretaceous ammonoid cephalopod Hoploscaphites. Middle: Life restoration of two of the Permian-Late Cretaceous cartilaginous fish Hybodus. Right: Living Hydnophora coral.}} †Hoploscaphites - †Huetamia
- †Hybodus
- †Hybodus brevicostatus – or unidentified comparable form
- †Hybodus butleri – type locality for species
- †Hydnophora – tentative report
- †Hydnophora styriaca – type locality for species
- †Hydrotribulus
- †Hylaeobatis – or unidentified comparable form
- †Hypacanthoplites
- †Hypacanthoplites bakeri
- †Hypacanthoplites chihuahuaensis
- †Hypacanthoplites cragini
- †Hypacanthoplites quitmanensis
- †Hypacanthoplites rugosus
- †Hypacanthoplites sellardsi
- †Hypacanthoplites umbilicostatus
- †Hypolophus
- †Hypolophus mcnultyi – type locality for species
- †Hypophylloceras
- †Hypophylloceras tanit – or unidentified comparable form
- †Hypoturrilites
I{{Compact ToC}} | total_width = 330 | image1 = Ichthyodectes_ctenodon.jpg | alt1 = | image2 = Ichthyornis restoration.jpeg | alt2 = | image3 = Inoceramus steenstrup, world's largest fossil mollusk.jpg | alt3 = | footer = Left: Life restoration of the Late Cretaceous bony fish Ichthyodectes. Middle: Life restoration of the Late Cretaceous toothed bird Ichthyornis. Right: Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size.}} †Ichthyodectes - †Ichthyornis
- †Idoceras
- †Idoceras clarki
- †Idoceras schucherti
- †Iguanodon – or unidentified comparable form
- †Inoceramus
- †Inoceramus anomalus – or unidentified comparable form
- †Inoceramus arnoldi
- †Inoceramus arvanus
- †Inoceramus balticus
- †Inoceramus biconstrictus
- †Inoceramus cordiformis – or unidentified comparable form
- †Inoceramus cummingsi
- †Inoceramus deformis
- †Inoceramus dimidius
- †Inoceramus eulessanus
- †Inoceramus fragilis
- †Inoceramus prefragilis
- †Inoceramus vanuxemi – tentative report
- †Irenesauripus
- †Irenesauripus glenrosensis
- †Isastrea
- †Isastrea whitneyi – type locality for species
- †Ischyrhiza
- †Ischyrhiza avonicola
- †Ischyrhiza mira
- †Ischyrhiza monasterica – type locality for species
- †Isomicraster
- †Isomicraster danei
- †Isomicraster rossi – type locality for species
J{{Compact ToC}}- †Jeletzkytes
- Juliacorbula
- †Juliacorbula linteroidea
- †Juliacorbula monmouthensis
K{{Compact ToC}}- †Kamerunoceras
- †Kamerunoceras calvertense
- †Kamerunoceras eschii – or unidentified comparable form
- †Kasanskyella
- †Kasanskyella cuchillensis – tentative report
- †Kasanskyella fosteri
- †Kasanskyella spathi
- †Kasanskyella whitneyi – tentative report
- †Kazanskyella
- †Kazanskyella cuchillense
- †Kazanskyella fosteri
- †Kazanskyella minima
- †Kazanskyella trinitensis
- †Kazanskyella whitneyi
- †Kermackia – type locality for genus
- †Kermackia texana – type locality for species
- †Kimbleia
- †Kimbleia albrittoni
- †Kimbleia capacis
- {{multiple image
| total_width = 248 | image1 = Apachesaurus.jpg | alt1 = | image2 = Kritosaurus BW.jpg | alt2 = | footer = Left: Life restoration at various ages of the Late Triassic amphibian Koskinonodon with an anachronistic human to scale. Right: Life restoration of the Late Cretaceous duck-billed dinosaur Kritosaurus.}} †Koskinonodon – type locality for genus - †Koskinonodon perfectus – type locality for species
L{{Compact ToC}}- †Laevigyra
- †Lamellaerhynchia
- †Lamellaerhynchia indi – type locality for species
- †Lamellaerhynchia viae – type locality for species
- Lamna
- †Lamna sulcata – or unidentified related form
- †Lanieria
- †Lanieria uvaldana – type locality for species
- †Lasalichthys
- Laternula
- †Laternula bartoni
- †Laternula johnsonana
- †Laternula robusta
- †Laternula sublevis
- †Laternula sulcatina
- †Laternula tofana
- †Laternula virgata
- †Latiala
- †Latiastrea
- Latiaxis
- †Latiscopus – type locality for genus
- †Latiscopus disjunctus – type locality for species
- †Laxispira
- †Laxispira lumbricalis
- †Laxispira monilifera
- †Legumen
- †Legumen ellipticum
- †Legumen ligula
- Lenticulina
- †Lenticulina cyprina
- †Lenticulina gaultina
- †Lepidotes
- Lepisosteus
- †Leptarbacia
- Leptomaria
- †Leptomaria austinensis
- †Leptomaria robusta
- †Leptorhynchos – type locality for genus
- †Leptorhynchos gaddisi – type locality for species
- †Leptosolen
- †Leptosolen angustus
- †Leptosolen biplicata
- †Leptosolen levis
- †Leptosolen linguliformis
- †Leptosolen quadrilaterus
- †Leptosolen quadriliratus
- †Leptostyrax
- †Leptostyrax bicuspidatus
- †Leptostyrax macrorhiza
- †Leptosuchus
- †Leptosuchus crosbiensis – type locality for species
- †Leptosuchus imperfecta – type locality for species
- †Leptosuchus studeri – type locality for species
- †Levicerithium
- †Levicerithium altum
- †Levicerithium basicostae
- †Levicerithium breviforme
- †Levicerithium microlirae – tentative report
- †Levicerithium planum
- †Levicerithium timberanum
- †Lewesiceras
- †Lewyites
- †Leyvachelys
- †Libognathus – type locality for genus
- †Libognathus sheddi – type locality for species
- †Libonectes
- †Libonectes morgani – type locality for species
- Lima
- †Lima acutilineata texana
- †Lima coahuilensis
- †Lima cokei
- †Lima deatsvillensis
- †Lima generosa
- †Lima geronimioensis
- †Lima geronimoensis
- †Lima guadalupensis
- †Lima pelagica
- †Lima wacoensis
- Limatula
- Limea
- Limopsis
- †Linearia
- †Linearis
- †Linearis concentrica
- †Linearis metastriata
- †Linearis navarroana
- †Linearis pectinis
- †Linearis wieserae
- Lingula
- †Linter
- †Linthia
- Linuparus
- †Linuparus adkinsi
- †Linuparus grimmeri
- †Linuparus watkinsi
- †Lioestheria – tentative report
- †Liopeplum
- †Liopeplum cretaceum
- †Liopeplum eiodermum
- †Liopeplum leioderma
- †Liopeplum leioderma breve
- †Liopeplum leioderma longum
- †Liopeplum leioderma tabulatum
- †Liopeplum rugosum
- †Liopistha
- †Liopistha alternata
- †Liopistha formosa
- †Liopistha protexta
- †Liothyris
- †Liothyris carolinensis – or unidentified comparable form
- †Liothyris navarroana
- Liquidambar – tentative report
- †Lirosoma
- †Lispodesthes
- †Lispodesthes lirata
- †Lispodesthes panda
- †Lispodesthes patula
- †Lissodus
- †Lissodus babulski – or unidentified related form
- †Lithacoceras
- Lithophaga
- †Lomirosa
- †Lonchidion
- †Lonchidion anitae – type locality for species
- †Lonchidion humblei – type locality for species
- †Lonchidion selachos
- †Longoconcha
- †Longoconcha dalli
- †Longoconcha navarroensis
- †Longosuchus
- †Longosuchus meadei – type locality for species
- †Longosuchus meadi
- Lopha
- †Lopha falcata
- †Lopha mesenterica
- †Lopha subovata
- †Loriolia
- †Lowenstamia
- †Lowenstamia subplanus – or unidentified comparable form
- †Loxostomoides
- †Lucasuchus – type locality for genus
- †Lucasuchus hunti – type locality for species
- Lucina
- †Lucina aspera
- †Lucina chatfieldana
- †Lucina dentonana
- †Lucina glebula
- †Lucina oleodorsum
- †Lucina potosina
- †Lucina seminolis
- †Luisogalathea
- †Lupira
- †Lutema
- †Lutema geniculata
- †Lutema hubbardi
- †Lutema munda
- †Lutema simpsonensis
- †Lycettia
- †Lycettia tippana
- †Lycettia tippanus
- †Lyriochlamys – tentative report
M{{Compact ToC}}- †Macraster
- †Macraster arguilera
- †Macraster elegans
- †Macraster nodopyda
- †Macrepistius
- †Macrocerithium
- †Macrocerithium tramitense
- †Macromesodon
- †Magadiceramus
- †Magadiceramus complicatus
- †Magadiceramus crenelatus
- †Magadiceramus crenistriatus – or unidentified comparable form
- †Magadiceramus subquadratus
- †Magnoavipes – type locality for genus
- †Magnoavipes lowei – type locality for species
- †Malerisaurus
- Malletia
- †Malletia littlei
- †Malletia longfrons
- †Malletia longifrons
- †Malletia stephensoni
- †Mammites
- †Mammites powelli – type locality for species
- {{multiple image
| total_width = 248 | image1 = Gasteropods - Ammonites - Mantelliceras tuberculatum.JPG | alt1 = | image2 = Mariella lewesiensis.jpg | alt2 = | footer = Left: Fossilized shell of the Late Cretaceous ammonoid cephalopod Mantelliceras. Right: Fossilized shell of the Early-Late Cretaceous ammonoid cephalopod Mariella.}} †Mantelliceras - †Mantelliceras cantianum
- †Mantelliceras martimpreyi – or unidentified comparable form
- †Mantelliceras saxbii
- †Margaritella
- †Mariella
- †Mariella bosquensis
- †Mariella brazoensis
- †Mariella camachoensis
- †Mariella cenomanensis – or unidentified comparable form
- †Mariella davisense
- †Mariella rhacioformis
- †Mariella wysogorskii
- †Mataxa
- †Mataxa subteres
- †Mataxa valida
- †Mataxa valida multilirae
- †Mathilda
- †Mathilda cedarensis
- †Mathilda corona
- †Meandraraea
- †Meandraraea plummeri – type locality for species
- †Meandraraea tulae – or unidentified comparable form
- †Medionapus
- Megalomphalus – or unidentified comparable form
- †Megalosauropus – tentative report
- †Megalosauropus titanopelobatidus – type locality for species
- Melanatria
- †Melicertites
- Membranipora
- Membraniporidra
- †Menabites
- †Menabites austinensis
- †Menabites danei
- †Menabites delawarensis
- †Menabites vanuxemi
- {{multiple image
| total_width = 330 | image1 = Meniscoessus skull.jpg | alt1 = | image2 = Menuites soyaensis - National Museum of Nature and Science, Tokyo - DSC06958.JPG | alt2 = | image3 = Mesalia_multisulcata_01.JPG | alt3 = | footer = Left: Fossilized skull of the Late Cretaceous multituberculate mammal Meniscoessus. Middle: Assemblage of fossilized shells of the Late Cretaceous ammonoid cephalopod Menuites. Right: Multiple views of a fossilized shell of Mesalia tower sea snail.}} †Meniscoessus - †Menuites
- Mesalia
- †Mesodma
- †Mesomorpha
- †Mesomorpha excavata
- †Mesomorpha vaughani – type locality for species
- †Metengonoceras
- †Metengonoceras acutum
- †Metengonoceras ambiguum
- †Metengonoceras bravoense
- †Metengonoceras dumbli
- †Metengonoceras inscriptum
- †Metoicoceras
- †Metoicoceras crassicostae
- †Metoicoceras geslinianum
- †Metoicoceras latoventer
- †Metoicoceras swallovi
- †Metoicoceras swallovii
- †Metoicoceras swallovii macrum
- †Metoposaurus
- †Metoposaurus bakeri – type locality for species
- †Metoposaurus fraasi
- †Metoposaurus jonesi – type locality for species
- †Metoposaurus perfecta
- †Mexicaprina
- †Micrabacia
- †Micrabacia marylandica
- †Micrabacia radiata – type locality for species
- †Micraster
- †Micraster americanus
- †Micraster uddeni – type locality for species
- †Microsolena
- †Microsolena texana – type locality for species
- †Microsulcatoceras
- †Microsulcatoceras texanum – type locality for species
- †Miocardiopsis
- †Miocardiopsis hendersoni
- †Miocardiopsis shumardi
- {{multiple image
| total_width = 248 | image1 = Mytilidae - Modiolus species.JPG | alt1 = | image2 = Ishidatami0904.jpg | alt2 = | footer = Left: Fossilized shell of the Devonian-modern marine bivalve Modiolus, or horsemussel. Right: Shell of a Monodonta top sea snail.}} †Modiolus - †Modiolus sedesclaris
- †Modiolus sedesclarus
- †Modiolus sedisclarus
- Monodonta – tentative report
- †Monopleura – tentative report
- †Monroea
- Montastrea
- †Montastrea comalensis
- †Montastrea edwardsensis – type locality for species
- †Montastrea pecosensis – type locality for species
- †Montastrea roemeriana – type locality for species
- †Montastrea texana
- †Montastrea travisensis
- †Montastrea whitneyi
- †Morea
- †Morea cancellaria
- †Morea cancellaria corsicanensis
- †Morea cancellaria crassa
- †Morea marylandica
- †Morea marylandica bella
- †Morea marylandica languida
- †Morea transenna
- †Moremanoceras
- †Moremanoceras elgini
- †Moremanoceras flexuosum – type locality for species
- †Morphastrea
- †Morphastrea barcenai – or unidentified comparable form
- {{multiple image
| total_width = 248 | image1 = Mortoniceras inflatum 01.JPG | alt1 = | image2 = Mosasaurus BW.jpg | alt2 = | footer = Left: Fossilized shell of the Early Cretaceous ammonoid cephalopod Mortoniceras. Right: Life restoration of two of the Late Cretaceous Mosasaurus.}} †Mortoniceras - †Mortoniceras austinensis
- †Mortoniceras drakei
- †Mortoniceras maxima
- †Mortoniceras minima
- †Mortoniceras perinflatum
- †Mortoniceras rostratum
- †Mortoniceras wintoni
- †Mosasaurus
- †Mosasaurus maximus
- †Mosasaurus missouriensis – tentative report
- †Myobarbum
- †Myriophyllia – tentative report
- †Myriophyllia dumblei – type locality for species
- Myrtea
- †Mytiloides
- †Mytilus
N{{Compact ToC}}- †Naomichelys
- †Napulus
- †Napulus octoliratus
- †Napulus tuberculatus
- Natica
- †Natica dorothiensis
- †Natica humilis
- †Natica rivulana
- †Natica striaticostata
- Nebrius
- †Neithea
- †Neithea bexarensis
- †Neithea quinquecostata
- †Nelltia
- †Nemocardium
- †Nemocardium fragile
- †Nemocardium guadalupense
- †Nemocardium marcosensis
- †Nemocardium tenue
- †Nemodon
- †Nemodon adkinsi
- †Nemodon bowiei
- †Nemodon eufalensis
- †Nemodon eufaulensis
- †Nemodon eufaulensis lineatus
- †Nemodon grandis
- †Nemodon grandis navarroanus
- †Nemodon martindalensis
- †Nemodon navarroanus
- †Nemodon punctus
- †Neobrites
- †Neocardioceras
- †Neodeshayesites
- †Neodeshayesites comalensis
- †Neodeshayesites mayfieldensis
- †Neogauthiericeras
- †Neogauthiericeras zafimahovai
- †Neohibolites
- †Neophlycticeras
- †Neophlycticeras archerae – type locality for species
- †Neophlycticeras blancheti – or unidentified comparable form
- †Neophlycticeras fascicostatum – type locality for species
- †Neophlycticeras roemeri
- †Neophlycticeras texanum
- †Neoptychites
- †Nerinea – tentative report
- Nerita
- †Nerita ornata
- †Nerita semilevis
- Neritina
- †Neritina ambrosana
- †Neritina insolita
- Nodosaria
- †Nonactaeonina
- †Nonactaeonina deflexa
- †Nonactaeonina graphoides
- †Nonactaeonina tensa
- †Nonactaeonina triticea
- †Nonaphalagodus – type locality for genus
- †Nonaphalagodus trinitiensis – type locality for species
- †Nostoceras
- †Nostoceras approximans
- †Nostoceras colubriformis
- †Nostoceras draconsis
- †Nostoceras helicinum crassum
- †Nostoceras helicinum humile
- †Nostoceras helicinus
- †Nostoceras hyatti
- †Nostoceras splendidum
- †Nostoceras stantoni aberrans
- †Nostoceras stantoni prematurum
- †Notodonax
- †Notopoides – tentative report
- †Notopoides pflugervillensis – type locality for species
- †Nucleopygus
- Nucula
- †Nucula camia
- †Nucula chatfieldensis
- †Nucula chatsfieldensis
- †Nucula ciboloensis
- †Nucula cuneifrons
- †Nucula microstriata
- †Nucula nacatochana
- †Nucula percrassa
- †Nucula perequalis
- †Nucula rivulana
- †Nucula stantoni
- †Nucula waltonensis
- Nuculana
- †Nuculana coloradoensis
- †Nuculana corbetensis
- †Nuculana corsicana
- †Nuculana houstoni
- †Nuculana mutuata
- †Nuculana protexta
- †Nuculana rostratruncata
- †Nuculana travisana
- †Nuculana whitfieldi
- †Nudivagus – tentative report
- †Nymphalucina
- †Nymphalucina linearia
- †Nymphalucina parva
- †Nyssa
O{{Compact ToC}}- †Odaxosaurus
- Odontaspis
- †Ogilviastraea – tentative report
- †Ogilviastraea richardsi – type locality for species
- †Oklatheridium
- †Oklatheridium minax
- †Oklatheridium szalayi
- †Oligoptycha
- †Oligoptycha americana – tentative report
- {{multiple image
| total_width = 248 | image1 = Onchopristis numidus 052013.JPG | alt1 = | image2 = Sclerorhynchidae - Onchosaurus marocanus.JPG | alt2 = | footer = Left: Fossilized tooth of the Late Cretaceous giant sawfish Onchopristis. Right: Fossilized vertebrae of the Cretaceous sawfish Onchosaurus.}} †Onchopristis - †Onchosaurus
- †Opertochasma
- †Opertochasma scaphoides
- †Opertochasma subconicum
- †Opertochasma venustum
- †Ophiomorpha
- †Ophiopsis – tentative report
- Ophiura
- †Ophiura graysonensis
- †Ophiura texana
- †Ophiura travisana – type locality for species
- †Opis
- †Opis elevata – tentative report
- †Ornithomimus
- †Ornopsis
- †Ornopsis digressa
- †Ornopsis maxeyi
- †Ornopsis pulchra
- †Ornopsis solistella
- {{multiple image
| total_width = 248 | image1 = Turrilitidae - Ostlingoceras puzosianum.JPG | alt1 = | image2 = Oyster.jpg | alt2 = | footer = Left: Fossilized shell of the Late Cretaceous ammonoid cephalopod Ostlingoceras. Right: Shell of an Ostrea, or oyster.}} †Ostlingoceras - Ostrea
- †Ostrea alternans
- †Ostrea bella
- †Ostrea beloiti
- †Ostrea carica
- †Ostrea carinata – or unidentified related form
- †Ostrea crenulimargo
- †Ostrea leveretti
- †Ostrea lugubris
- †Ostrea owenana
- †Ostrea panda
- †Ostrea rubradiata
- †Ostrea soleniscus
- †Ostrea subovata
- †Ostrea subradiata
- †Otischalkia – type locality for genus
- †Otischalkia elderae – type locality for species
- †Ovalastrea – type locality for genus
- †Ovalastrea fredericksburgensis – type locality for species
- †Ovalastrea pecosensis – type locality for species
- †Oxyrhina
- †Oxytropidoceras
- †Oxytropidoceras acuticarinatum
- †Oxytropidoceras acutocarinatum
- †Oxytropidoceras bravoensis
- †Oxytropidoceras carbonarium
- †Oxytropidoceras diazi
- †Oxytropidoceras moorei
- †Oxytropidoceras multifidum
- †Oxytropidoceras pandalense – or unidentified comparable form
- †Oxytropidoceras powelli
- †Oxytropidoceras salasi
- †Oxytropidoceras stenzeli
- †Oxytropidoceras supani
- †Oxytropidoceras texanum
- †Oxytropidoceras uddeni
P{{Compact ToC}}- †Pachycheilosuchus – type locality for genus
- †Pachycheilosuchus trinquei – type locality for species
- †Pachydesmoceras
- {{multiple image
| total_width = 330 | image1 = Pachydiscus neubergicus.jpg | alt1 = | image2 = Pachygenelus.jpg | alt2 = | image3 = Pagurus armatus.jpg | alt3 = | footer = Left: Fossilized shell of the Late Cretaceous ammonoid cephalopod Pachydiscus. Middle: Restorative portrait of the Early Jurassic synapsid (mammal precursor) Pachygenelus. Right: A living Pagurus hermit crab.}} †Pachydiscus - †Pachydiscus arkansanus
- †Pachydiscus paulsoni
- †Pachydiscus scotti
- †Pachydiscus travisi
- †Pachygenelus
- †Pachygenelus milleri – type locality for species
- †Pachymelania
- †Pachymya
- Pagurus
- †Paladmete
- †Paladmete alta
- †Paladmete cancellaria
- †Paladmete cancelleria
- †Paladmete corbuliformis
- †Paladmete elegans
- †Paladmete gardnerae
- †Paladmete inequalis
- †Palaeobalistum
- †Palaeobalistum geiseri – type locality for species
- †Palaeobalistum rectidens – type locality for species
- †Palaeoctonus
- †Palaeoctonus dumblianus – type locality for species
- †Palaeoctonus orthodon – type locality for species
- †Palaeocypraea
- †Palaeocypraea corsicanana
- †Palaeocypraea nuciformis
- †Palaeogaleus
- †Palaeogaleus navarroensis – type locality for species
- †Paleollanosaurus – type locality for genus
- †Paleollanosaurus fraseri – type locality for species
- †Paleomolops
- †Paleomolops langstoni – type locality for species
- †Paleopsephaea
- †Paleopsephaea decorosa
- †Paleopsephaea patens
- †Paleopsephaea sinuosa
- †Paleopsephaea vadoana
- †Paleorhinus
- †Paleorhinus sawini – type locality for species
- †Paluxysuchus – type locality for genus
- †Paluxysuchus newmani – type locality for species
- †Panis
- Panopea
- †Panopea anacachoensis – type locality for species
- †Panopea subplicata
- †Pantojaloria
- †Pappotherium – type locality for genus
- †Pappotherium pattersoni – type locality for species
- †Paracimexomys
- Paracyprideis
- †Paracyprideis graysonensis
- Paracypris
- †Parafusus – tentative report
- †Parahoplites
- †Parahoplites thomasi
- †Parahoplites wintoni
- †Paraisurus
- †Paramicrodon – type locality for genus
- †Paramicrodon estesi – type locality for species
- †Parandiceras
- †Parandiceras indicum – or unidentified comparable form
- †Paranecrocarcinus
- †Paranecrocarcinus moseleyi
- †Paranecrocarinus
- †Paranomia
- †Parapuzosia
- †Parapuzosia americana – type locality for species
- †Parapuzosia bosei – type locality for species
- †Parapuzosia sealei – type locality for species
- †Parasaniwa – or unidentified comparable form
- Parasmilia
- †Parasmilia austinensis
- †Parasmilia bullardi – type locality for species
- †Parasmilia graysonensis – type locality for species
- †Parasuchus
- †Paratypothorax
- †Paraxiopsis
- †Parengonoceras
- †Parmicorbula
- †Parmicorbula corneliana
- †Parmicorbula hillensis
- †Parmicorbula numerosa
- †Parmicorbula rupana
- †Parmicorbula sinuosa
- †Parmicorbula suffalciata
- †Parmicorbula terramaria
- †Parmicorbula vokesi
- †Paronychodon
- †Paronychodon lacustris – or unidentified comparable form
- Parvamussium
- †Parvivoluta – tentative report
- Patellina
- {{multiple image
| total_width = 248 | image1 = Pawpawsaurus.PNG | alt1 = | image2 = Pecten maximus Pilgermuschel.jpg | alt2 = | footer = Left: Fossilized skull in multiple views of the Early Cretaceous armored dinosaur Pawpawsaurus. Right: Shells of Pecten scallops.}} †Pawpawsaurus – type locality for genus - †Pawpawsaurus campbelli – type locality for species
- †Pecten
- †Pecten bellula
- †Pecten bellulus
- †Pecten catherina
- †Pecten georgetownensis
- †Pecten moodyi
- †Pecten subalpinus
- †Pecten texanus
- †Pecten venustus
- †Pecten wrighti
- †Pedinopsis
- †Peilinia
- †Pekinosaurus – or unidentified related form
- †Peneteius
- Periploma
- †Periplomya
- Perna – report made of unidentified related form or using admittedly obsolete nomenclature
- †Perrisonota
- †Perrisonota littlei
- †Perrisonota protexta
- Petrophyllia
- †Phacellocoenia – tentative report
- †Phacellocoenia tolmachoffana – type locality for species
- Phacoides
- †Pharodina
- †Phelopteria
- †Phelopteria dalli
- †Phelopteria linguaeformis
- †Phelopteria timberensis
- Pholadidea
- Pholadomya
- †Pholadomya coahuilensis
- †Pholadomya goldenensis
- †Pholadomya ingens
- †Pholadomya littlei
- †Pholadomya occidentalis
- †Pholadomya shattucki
- Pholas
- †Phyllobrissus
- †Phymosoma
- †Phytosaurus
- †Piestochilus
- †Piestochilus curviliratus
- †Piestochilus levis
- †Pinella
- †Pinna
- †Pirsila
- †Pirsila decora
- †Pirsila simpla
- †Pirsila tensa
- Pitar
- †Placenticeras
- †Placenticeras interealare
- †Placenticeras meeki
- †Placenticeras syrtale
- Placopsilina
- †Placotrochus
- Plagioecia
- †Planocephalosaurus
- †Planocephalosaurus lucasi – type locality for species
- Planulina
- †Planulina eaglefordensis
- {{multiple image
| total_width = 330 | image1 = Platecarpus tympaniticus.jpg | alt1 = | image2 = Platyceramus platinus with Pseudoperna congesta, Gove County, Kansas, USA, Late Cretaceous - Royal Ontario Museum - DSC00063.JPG | alt2 = | image3 = Platypterigius kiprjanov2.jpg | alt3 = | footer = Left: Life restoration of the Late Cretaceous mosasaur Platecarpus. Middle: Fossilized shell of the Cretaceous marine bivalve Platyceramus. Right: Life restoration of the Early-Late Cretaceous ichthyosaur Platypterygius.}} †Platecarpus - †Platecarpus planifrons
- †Platecarpus somenensis – or unidentified comparable form
- †Platecarpus tympaniticus
- †Platiknemiceras
- †Platiknemiceras flexuosum
- †Platyceramus
- †Platyceramus cycloides
- †Platyceramus mantelli - or unidentified loosely related form
- †Platypterygius
- †Plesiacanthoceras
- †Plesiacanthoceras bellsanum
- †Plesiosaurus
- †Pleuriocardia
- †Pleuriocardia eufaulense
- †Pleuriocardia eufaulensis huntanum
- †Pleurocora
- †Pleuromya
- †Pleurosmilia
- †Pleurosmilia quaylei – type locality for species
- †Pleurosmilia saxifisi – type locality for species
- Pleurotomaria
- †Plicatolamna – or unidentified comparable form
- †Plicatoscyllium – type locality for genus
- †Plicatoscyllium antiquum – type locality for species
- †Plicatoscyllium derameei – type locality for species
- Plicatula
- †Plicatula clarki
- †Plicatula dentonensis
- †Plicatula goldenana
- †Plicatula incongrua
- †Plicatula mullicaensis
- †Plicatula tetrica
- †Plioaxius
- †Plioplatecarpus – tentative report
- †Poecilocrinus
- Polinices
- †Polinices kummeli
- †Polinices stephensoni
- †Pollex
- †Pollex angulatus
- †Pollex obesus
- †Polyacrodus
- †Polyacrodus parvidens – or unidentified related form
- †Polyptychodon
- †Polyptychodon hudsoni – type locality for species
- †Polytremacis
- †Polytremacis hancockensis – type locality for species
- †Polytremacis urgonensis
- †Pontocyprella
- †Pontocyprella alexanderi
- †Poposaurus
- †Poposaurus gracilis
- †Poposaurus langstoni
- †Porituberoolithus
- †Postligata
- †Postosuchus – type locality for genus
- †Postosuchus kirkpatricki – type locality for species
- †Praeleda
- †Prionocyclites
- †Prionocyclus
- †Prionocyclus albinus
- †Prionocyclus hyatti
- †Prionocyclus macombi
- †Prionocyclus wyomingensis
- †Priontropis
- †Priontropis woolgari – or unidentified related form
- †Priscomactra
- †Priscomactra cymba
- †Priscomactra munda
- †Procardia
- †Procheloniceras
- †Procheloniceras albrechtiaustriae – or unidentified related form
- †Prognathodon – tentative report
- †Promystriosuchus – type locality for genus
- †Promystriosuchus ehleri – type locality for species
- †Proraster
- †Proscincetes
- †Prosiren – type locality for genus
- †Prosiren elinorae – type locality for species
- †Protarca
- †Protecovasaurus – type locality for genus
- †Protecovasaurus lucasi – type locality for species
- †Protexanites
- †Protoavis – type locality for genus
- †Protoavis texensis – type locality for species
- †Protocallianassa
- †Protocallianassa pleuralum – type locality for species
- †Protocardia
- †Protocardia guadalupense
- †Protocardia hillana
- †Protocardia marcosensis
- †Protocardia spillmani
- †Protocardia texana
- †Protocardia timberensis
- †Protocardia torta
- †Protocardia wadei
- †Protodonax
- †Protodonax lingulatus
- †Protodonax lingulatus tensus
- †Protodonax robustus
- †Protohadros – type locality for genus
- †Protohadros byrdi – type locality for species
- †Protoplatyrhina
- †Protosphyraena
- †Proxestops
- †Pseudananchys
- †Pseudananchys stephensoni – type locality for species
- †Pseudaspidoceras
- †Pseudaspidoceras flexuosum
- †Pseudocalycoceras
- †Pseudocalycoceras angolaense
- †Pseudoclavulina
- †Pseudocoeniopsis – tentative report
- †Pseudocoeniopsis wintoni – type locality for species
- †Pseudocorax
- †Pseudogaudryinella
- †Pseudogaudryinella capitosa
- †Pseudohypolophus
- †Pseudolimea
- †Pseudolimea kimbroensis
- †Pseudolimea reticulata
- †Pseudolimea sellardsi
- Pseudomalaxis
- †Pseudomalaxis patens
- †Pseudomalaxis pateriformis
- †Pseudomelania
- †Pseudomelania basicostata
- †Pseudomelania ferrata
- †Pseudomelania roanokana
- †Pseudoncrocarcinus
- †Pseudoncrocarcinus scotti
- †Pseudoperna
- †Pseudopetalodontia
- †Pseudopetalodontia felixi
- †Pseudoptera
- †Pseudoptera hornensis
- †Pseudoptera hornesis
- †Pseudoptera rushana
- †Pseudoptera serrata
- †Pseudoptera viana
- †Psilomya
- †Psilomya concentrica
- †Psilomya levis
- †Pteranodon – or unidentified comparable form
- †Pteria
- †Pteria linguaeformis – tentative report
- †Pteria rhombica
- †Pterocerella
- †Pterocerella densatus
- †Pterocerella densatus nacatochanus
- †Pterocerella poinsettiformis
- †Pterocerella robustus
- †Pterot
- †Pterot castrovillensis – or unidentified related form
- †Pterotrigonia
- †Pterotrigonia castrovillensis
- †Pterotrigonia eufalensis
- †Pterotrigonia eufaulensis
- †Pterotrigonia eufaulensis gabbi
- †Pterotrigonia marionensis
- †Pterotrigonia stantoni
- †Ptychomya
- †Ptychotrygon
- †Ptychotrygon vermiculata
- †Ptychotrygon winni – type locality for species
- †Pugnellus
- †Pugnellus densatus
- †Pugnellus goldmani
- {{multiple image
| total_width = 248 | image1 = Desmoceratidae - Puzosia compressa.JPG | alt1 = | image2 = Pycnodonte pulaskiensis Clayton.jpg | alt2 = | footer = Left: Fossilized shell of the Early-Late Cretaceous ammonoid cephalopod Puzosia. Right: Assemblage of fossilized shells of the Cretaceous-Pleistocene oyster Pycnodonte.}} †Puzosia - †Puzosia crebrisulcata – or unidentified comparable form
- Pycnodonte
- †Pycnodonte belli
- †Pycnodonte mutabilis
- †Pycnodonte vesicularis
- †Pycnomicrodon
- †Pyrgulifera
- †Pyrgulifera costata
- †Pyrgulifera costata sublevis
- †Pyrgulifera costata tuberata
- †Pyrgulifera ornata
- †Pyrifusus
- †Pyrina
- †Pyropsis
- †Pyropsis lanhami
- †Pyropsis proxima – or unidentified related form
Q{{Compact ToC}}- †Quayia – or unidentified comparable form
- †Quetzalcoatlus – type locality for genus
- †Quetzalcoatlus northropi – type locality for species
- †Quitmaniceras
- †Quitmanites
- †Quitmanites ceratitosus
- †Quitmanites evolutus
R{{Compact ToC}}- †Rachiosoma
- †Rachiosoma hondoensis – type locality for species
- †Radiopecten
- †Radiopecten mississippiensis
- Raja
- †Raja farishi – type locality for species
- †Ramsetia
- †Raninella
- †Remera
- †Remera decora
- †Remera juncea
- †Remera microstriata
- †Remnita
- †Remnita anomalocostata
- †Remnita biacuminata
- †Remondia
- Reophax
- †Reptomulticava
- †Restes
- †Rewaconodon – or unidentified related form
- †Rhamphidoceras – type locality for genus
- †Rhamphidoceras saxatilis – type locality for species
- {{multiple image
| total_width = 248 | image1 = Rhinobatos rhinobatos.jpg | alt1 = | image2 = Rhombodus NT small.jpg | alt2 = | footer = Left: A living Rhinobatos guitar fish. Right: Life restoration of the Late Cretaceous-Paleocene ray Rhombodus.}} Rhinobatos - †Rhinobatos craddocki – type locality for species
- †Rhinobatos uvulatus – type locality for species
- †Rhombodus
- †Rhytidohoplites
- †Rhytidohoplites robertsi
- †Rhytophorus – tentative report
- †Richardoestesia
- †Richardoestesia gilmorei
- †Richardoestesia isosceles – type locality for species
- †Rileymillerus – type locality for genus
- †Rileymillerus cosgriffi – type locality for species
- Ringicula
- †Ringicula anfractoline
- †Ringicula arlingtonensis
- †Ringicula culbertsoni
- †Ringicula pulchella
- †Ringicula sufflata
- Rogerella
- †Rogerella cragini – type locality for species
- †Romaniceras
- †Romaniceras aguilerai
- †Romaniceras zacatecana
- Rostellaria – tentative report
- †Russellosaurus – type locality for genus
- †Russellosaurus coheni – type locality for species
- †Rutiodon
S{{Compact ToC}}- Salenia
- †Salenia hondoensis – type locality for species
- †Sanmiguelia
- †Sanoarca
- †Sanoarca faucana
- †Sanoarca grandis
- †Sargana
- {{multiple image
| total_width = 248 | image1 = Sauroposeidon Scale Diagram Steveoc86.svg | alt1 = | image2 = Saurornitholestes digging Burrows wahweap.jpg | alt2 = | footer = Left: Diagram illustrating the Early Cretaceous long-necked dinosaur Sauroposeidon with anachronistic humans to scale. Right: Life restoration of the Late Cretaceous dromaeosaurid Saurornitholestes preying upon a multituberculate mammal.}} †Sauroposeidon - †Saurornitholestes
- †Saurornitholestes langstoni – or unidentified comparable form
- †Sauvagesia – tentative report
- †Saynella
- Scalpellum – tentative report
- †Scambula
- {{multiple image
| total_width = 248 | image1 = Scapanorhynchus raphiodon.jpg | alt1 = | image2 = SmallScaphites.jpg | alt2 = | footer = Left: Life restoration of several of the Early Cretaceous-Miocene shark Scapanorhynchus. Right: Fossilized shell of the Late Cretaceous ammonoid cephalopod Scaphites.}} †Scapanorhynchus - †Scapanorhynchus texanus
- †Scapanorhynchus textanus
- †Scapherpeton
- †Scaphites
- †Scaphites bosquensis – type locality for species
- †Scaphites brittonensis
- †Scaphites hippocrepis - or unidentified loosely related form
- †Scaphites rugosus
- †Scaphites warreni
- †Scaphites yorkensis
- †Schizobasis
- Scintilla – tentative report
- †Sciponoceras
- †Sclerorhynchus
- †Sclerorhynchus pettersi – type locality for species
- Scyliorhinus
- †Scyliorhinus ivagrantae – type locality for species
- {{multiple image
| total_width = 248 | image1 = Selaginella-sp.jpg | alt1 = | image2 = Semionotus bergeri.jpg | alt2 = | footer = Left: A living Selaginella, or spikemoss. Right: Fossilized skeleton of the Late Triassic-Early Jurassic bony fish Semionotus.}} †Selaginella – or unidentified comparable form - †Seminodicrescis
- †Seminola – tentative report
- †Semiometra
- †Semionotus – or unidentified comparable form
- †Senis
- †Senis elongata
- †Senis elongatus
- Serpula
- †Serpula cretacea
- †Serpula implicata
- †Serpula lineata
- †Serratolamna
- †Sexta
- †Sexta ethelana
- †Sexta navicula
- †Sharpeiceras
- †Sharpeiceras schlueteri
- †Sharpeiceras tlahualiloense
- †Shuparoceras
- †Shuvosaurus – type locality for genus
- †Shuvosaurus inexpectatus – type locality for species
- †Siderastrea
- †Siderastrea tuckerae – type locality for species
- †Siderofungia
- †Siderofungia irregularis
- †Sierritasuchus – type locality for genus
- †Sierritasuchus macalpini – type locality for species
- †Sinonia
- †Siphodictyum
- Siphotextularia
- †Siphotextularia washitaensis
- †Skolithos
- Smilotrochus
- †Smilotrochus palmerae – type locality for species
- †Solanocrinites
- †Solanocrinites wertheimi
- Solemya
- †Solemya bilix – tentative report
- †Solenoceras
- †Solenoceras multicostatum
- †Solenoceras reesidei
- †Solenoceras texanum
- †Solyma
- †Solyma bilix
- †Solyma elliptica
- †Solyma gardnerae
- †Solyma parva
- †Solyma stewarti
- †Spalacotheroides – type locality for genus
- †Spalacotheroides bridwelli – type locality for species
- †Spathites
- †Spathites coahuilaensis
- †Spathites rioensis
- †Specus
- †Sphenodiscus
- †Sphenodiscus intermedius
- †Sphenodiscus lobatus
- †Sphenodiscus pleurisepta
- †Sphenodiscus tirensis
- †Spinosuchus – type locality for genus
- †Spinosuchus caseanus – type locality for species
- †Spironema
- Spiroplectammina
- †Spiroplectammina ammovitrea
- †Spiroplectammina goodlandana
- {{multiple image
| total_width = 248 | image1 = Spondylus.jpg | alt1 = | image2 = Squalicorax pristodontus Agassiz, 1843 1.jpg | alt2 = | footer = Left: Shell of a Spondylus, or spiny oyster. Right: Fossilized tooth of the Late Cretaceous shark Squalicorax.}} Spondylus - †Spondylus hilli
- †Spondylus munitus
- †Spondylus siccus – type locality for species
- Squalicorax
- †Squalicorax kaupi
- †Squalicorax pristodontus
- Squalus
- †Squalus huntensis – type locality for species
- †Squatigaleus
- †Squatigaleus sulphurensis – type locality for species
- †Squatirhina
- †Stamenocella
- †Stantonella
- †Stearnsia
- †Stelidioseris
- †Stelidioseris bellensis – type locality for species
- †Stelidioseris pattoni – type locality for species
- †Stelidioseris whitneyi – type locality for species
- †Stellatopollis
- †Steorrosia
- Stephanocoenia – tentative report
- †Stephanomorpha – tentative report
- †Stephanomorpha saxirotundi – type locality for species
- †Stoliczkaia
- †Stoliczkaia argonautiformis
- †Stoliczkaia conlini – type locality for species
- †Stoliczkaia crotaloides
- †Stoliczkaia scotti
- †Stoliczkaia texana – type locality for species
- Stomatopora
- †Stomohamites – tentative report
- Striarca
- †Striarca cuneata
- †Striarca plummeri
- †Striarca saffordi
- †Striarca webbervillensis
- †Striaticostatum
- †Striaticostatum bexarense
- †Striaticostatum pondi
- †Striaticostatum sparsum
- †Struthiomimus – or unidentified comparable form
- †Suarodon
- †Sumitomoceras
- †Sumitomoceras bentonianum
- †Syncyclonema
- †Syncyclonema archeri
- †Syncyclonema kingi
- †Syncyclonema simplicius
- †Syncyclonema travisanus
- †Synorichthys – tentative report
T{{Compact ToC}}- †Tancredia – tentative report
- †Tanyosphaeridium
- †Tanyosphaeridium salpinx
- †Tarrantites
- †Tarrantoceras
- †Tarrantoceras cuspidum
- †Tarrantoceras sellardsi
- †Technosaurus – type locality for genus
- †Technosaurus smalli – type locality for species
- †Tecovasaurus – type locality for genus
- †Tecovasaurus murryi – type locality for species
- †Tecovasuchus – type locality for genus
- †Tecovasuchus chatterjeei – type locality for species
- Teinostoma
- Tellina
- †Tellina duganensis
- †Tellina dugansensis
- †Tellina munda
- †Tellina parkerana
- †Tellina patula
- †Tellina rivana
- †Tellina stabulana
- †Tellinimera
- †Tellinimera buboana
- †Tellinimera gabbi
- †Tellinimera munda
- †Tenea
- †Tenea parilis
- †Tenea patula
- †Tenontosaurus
- †Tenontosaurus dossi – type locality for species
- †Tentontosaurus
- †Tenuipteria
- †Tenuipteria argentea
- †Tenuipteria argenteus
- Terebratulina
- †Terebratulina filosa
- †Terebratulina noackensis
- †Terebrimya
- Teredolites
- †Terlinguachelys – type locality for genus
- †Terlinguachelys fischbecki – type locality for species
- †Terminonaris
- †Terminonaris robusta – or unidentified comparable form
- †Tetragonites
- †Tetragonites brazoensis – type locality for species
- †Texabatis – type locality for genus
- †Texabatis corrugata – type locality for species
- †Texacephale – type locality for genus
- †Texacephale langstoni – type locality for species
- †Texagryphea
- †Texanites
- †Texanites dentatocarinatum
- †Texanites gallicus
- †Texanites vanhoepeni
- †Texasetes – type locality for genus
- †Texasetes pleurohalio – type locality for species
- †Texasia
- †Texicaprina
- †Texigryphaea
- †Texigryphaea sashitaensis
- †Texigryphea
- †Texigryphea washitaensis
- Textularia
- †Textularia losangica
- †Textularia rioensis
- †Thamnasteria
- †Thamnasteria hoffmeisteri – type locality for species
- †Thamnoseris – tentative report
- †Thamnoseris morchella – type locality for species
- †Thecosmilia – tentative report
- †Thomasites
- †Thomelites
- †Thylacus
- †Thyracella
- †Tiarasmilia – type locality for genus
- †Tiarasmilia casteri – type locality for species
- †Tibiaporrhais – tentative report
- †Tibiaporrhais cooperensis
- †Tintorium
- †Tintorium pogodaformis – or unidentified comparable form
- †Titanosarcolites
- †Titanosarcolites oddsensis
- †Tornatellaea
- †Tornatellaea cretacea
- †Tornatellaea eretacea
- †Tornatellaea eretacea appressa
- †Tornatellaea gramdis
- †Tornatellaea scatesi
- †Toucasia
- †Toucasia hancockensis
- †Toucasia texana
- †Tovula
- †Trachybaculites
- Trachycardium
- †Trachycardium eufaulensis
- †Trachycardium tinninense
- †Trachyscaphites
- †Trachyscaphites densicostatus – type locality for species
- †Trachyscaphites porchi
- †Trachyscaphites spiniger
- {{multiple image
| total_width = 248 | image1 = LA-Triceratops mount-2.jpg | alt1 = | image2 = Trigoniidae - Trigonia interlaevigata.JPG | alt2 = | footer = Left: Mounted fossilized skeleton of the Late Cretaceous horned dinosaur Triceratops. Right: Fossilized shell of the Permian-Paleocene marine bivalve Trigonia.}} †Triceratops - †Triceratops utahensis – or unidentified comparable form
- †Trigonarca – tentative report
- †Trigonia
- †Trigonia clavigera
- †Trigonia emoryi
- †Trigonia goodellii
- †Trigonia munita
- †Trigonia proscabra
- †Trigonia stantoni
- †Trigonia vyschetzkii
- {{multiple image
| total_width = 330 | image1 = Trilophosaurus buettneri (1).jpg | alt1 = | image2 = Trinacromerum BW.jpg | alt2 = | image3 = Triodus1db.jpg | alt3 = | footer = Left: Life restoration of the Late Triassic reptile Trilophosaurus with an anachronistic human to scale. Middle: Life restoration of the Late Cretaceous plesiosaur Trinacromerum. Right: Life restoration of the Carboniferous-Triassic freshwater shark Triodus.}} †Trilophosaurus – type locality for genus - †Trilophosaurus buettneri – type locality for species
- †Trilophosaurus jacobsi
- †Trinacromerum – type locality for genus
- †Trinacromerum bentonianum – type locality for species
- †Trinitichelys – type locality for genus
- †Trinitichelys hiatti – type locality for species
- †Triodus
- †Triopticus – type locality for genus
- †Triopticus primus – type locality for species
- †Tristix
- †Tristix gigantea
- †Tristix quadrata
- †Trochactaeon
- Trochocyathus
- †Trochocyathus gardnerae – type locality for species
- †Trochocyathus scottianus – type locality for species
- †Trochocyathus sellardsi – type locality for species
- †Trochocyathus taylorensis – type locality for species
- †Trochocyathus wintoni – type locality for species
- †Trochocyathus woolmani
- †Trochoseris
- †Trochoseris shattucki – type locality for species
- †Trochosmilia
- †Trochosmilia stainbrooki – type locality for species
- †Troostella
- †Troostella brevispira
- †Troostella sublinearis
- Tryonia
- †Tundora
- Turboella
- †Turboella crebricostata
- †Turboella tallahatchiensis
- †Turgidodon
- †Turgidodon lillegraveni – or unidentified comparable form
- †Turrilites
- †Turrilites acutus
- †Turrilites saudersorum
- Turritella
- †Turritella anstini
- †Turritella bilira
- †Turritella delriensis
- †Turritella forgemoli – or unidentified comparable form
- †Turritella hilgardi
- †Turritella houstonia
- †Turritella macnairyensis
- †Turritella marnochi
- †Turritella paravertebroides
- †Turritella quadrilira
- †Turritella seriatimgranulata
- †Turritella shuleri
- †Turritella trilira
- †Turritella vertebroides
- †Turritella vertebroides jonesi
- †Turritella winchelli
- †Turseodus – tentative report
- {{multiple image
| total_width = 248 | image1 = Tylosaurus prorDB15.jpg | alt1 = | image2 = Tyrannosaurus Rex Holotype.jpg | alt2 = | footer = Left: Life restoration of the Late Cretaceous mosasaur Tylosaurus. Right: Mounted fossilized skeleton of the Late Cretaceous tyrannosaur Tyrannosaurus.}} †Tylosaurus - †Tylosaurus kansasensis
- †Tylosaurus nepaeolicus
- †Tylosaurus proriger – or unidentified comparable form
- †Typothorax
- †Tyrannosaurus
U{{Compact ToC}}- †Uddenia
- †Uktenadactylus
- †Uktenadactylus wadleighi – type locality for species
- †Unicardium
- Unio
- †Upogebia
- †Urceolabrum
- †Urceolabrum mantachieensis – tentative report
- †Urceolabrum tuberculatum
- †Ursirivus
- †Ursirivus arlingtonanus
- †Ursirivus fannensis
- †Ursirivus fanninensis
V{{Compact ToC}}- Vaginulina
- Valvulineria
- †Valvulineria asterigerinoides
- †Vancleavea
- †Vascellum
- †Vascellum elegans
- †Vascellum fortispirae
- †Vascellum leve
- †Vascellum magnum
- †Vascellum minusculum
- †Vascellum mundum
- †Vascellum mundum subteres
- †Vascellum pingue
- †Vascellum procerum
- †Vascellum rivanum
- †Vascellum robustum
- †Vascellum subleve
- †Vascellum tensum
- †Vascellum vascellum
- †Vascellum vascellum pressulum
- †Vascellum vascellum subornatum
- †Vascellum vianum
- †Vascoceras
- †Vascoceras cauvini – or unidentified comparable form
- †Vascoceras proprium
- †Vascoceras silvanense
- Venericardia
- †Veniella
- †Veniella conradi
- †Veniella lineata
- †Vetericardiella
- †Vetericardiella crenalirata
- †Vetericardiella webbervillensis
- †Vicarya
- †Vinella
- Viviparus – tentative report
- Volsella
- †Volsella alveolana
- †Volsella modesta
- †Volsella tarrantana
- †Volsella uddeni
- †Volutomorpha
- †Volutomorpha aspera
- †Volutomorpha conradi
- †Volutomorpha graysonensis
- †Volutomorpha retifera
- †Voysa
- †Voysa compacta
- †Voysa constricta
- †Voysa eulessana
- †Voysa lepida
- †Voysa minor
- †Voysa planolata
- †Voysa savoiana
- †Voysa speciosa
- †Voysa varia
- †Voysa varia extensa
- †Voysa varia levicostae
- †Voysa varia nodosa
- Vulsella
- †Vulsella alveolana
- †Vulsella tarrantana
W{{Compact ToC}}- †Wadeopsammia
- †Wannchampsus – type locality for genus
- †Wannchampsus kirpachi – type locality for species
- †Wannia
- †Wannia scurriensis – type locality for species
- †Washitaster
- †Weeksia
- †Woodbinax
- †Woodbinesuchus – type locality for genus
- †Woodbinesuchus byersmauricei – type locality for species
- †Worthoceras
- †Worthoceras gibbosum
- †Worthoceras vermiculum – or unidentified comparable form
- †Wrightoceras
X{{Compact ToC}}- Xanthosia
- †Xanthosia pawpawensis
- †Xanthosia reidi
- †Xanthosia wintoni
- †Xenacanthus – report made of unidentified related form or using admittedly obsolete nomenclature
- Xenophora
- †Xiphactinus
- †Xylophagella
Y{{Compact ToC}}- †Yezoites
- Yoldia
- †Yoldia septariana
- †Yoldia subacuta
References- {{cite web |title=Fossilworks: Gateway to the Paleobiology Database |author=Various Contributors to the Paleobiology Database |url=http://fossilworks.org/ |accessdate=7 August 2017}}
{{Era nav|title=Lists of the prehistoric life of Texas|prefix=List of the |suffix= life of Texas}}{{Lists of the Mesozoic life of the United States}}{{portalbar|Paleontology|Mesozoic|Texas}} 6 : Geology of Texas|Lists of prehistoric life in the United States|Natural history of Texas|Paleontology in Texas|Mesozoic Texas|Mesozoic life of North America |