“Radstockiceras”的意思、由来-开放百科全书

词条

Radstockiceras

释义

Distribution
Sources

{{italic title}}{{Taxobox
| fossil_range = {{fossil range|Sinemurian|Pliensbachian|ref=^[1]^[2]}}
| regnum = Animalia
| phylum = Mollusca
| classis = Cephalopoda
| subclassis = Ammonoidea
| ordo = Ammonitida
| superfamilia = Psiloceratoidea
| familia = Oxynoticeratidae
| genus = Radstockiceras
| genus_authority = Buckman, 1918
| type species = Radstockiceras complicatum Buckman, 1918
| subdivision_ranks = Species
| subdivision =

R. buvigneri d’Orbigny, 1844
R. complanosum Simpson, 1855
R. complicatum Buckman, 1918
R. coynarti d’Orbigny, 1844
R. fastigatum Venturi et al, 2005
R. gemmellaroi Pompeckj, 1906
R. hechingense Schlatter, 1980
R. involutum Pompeckj, 1906
R. lynx d’Orbigny, 1844
R. oscensis Rivas, 1977
R. pseudosaemanni Rivas, 1977
R. wiltshirei Wright, 1881

| synonyms =

Fastigiceras Buckman, 1919
Retenticeras Buckman, 1920
Metoxynoticeras Spath, 1922
Phylloxynoticeras Buckman, 1924
Homoxynoticeras Buckman, 1925
Kleistoxynoticeras Buckman, 1925
Carixiceras Spath, 1925
Radstokiceras Roman, 1938
Oxynoticeroides Dommergues et al, 1986

}}Radstockiceras is an extinct genus of lower Jurassic ammonite that lived from Oxynotum zone of upper Sinemurian to Raricostatum zone of lower Pliensbachian. Shells of these animals were oxycone and involute with umbilicus that took maximum of 12% of diameter in the case of outer whorls. On inner whorls, venter has been sharp, but then it became rounded. Faint ribs had falcoid shape, but sometimes, ribs could absent. Shells could have been large in their size. Suture has been very complex, similar to Oxynoticeras, but culmination at umbilical margin has been missing.^[1] Genus has been named after town of Radstock, in Somerset.^[3]

Distribution

Fossils belonging to this genus are found in Europe, South America, North Africa and Turkey.^[1]^[4]

Sources

1. ^¹²M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
2. ^{{cite web | last = Sepkoski| first = Jack| title= Sepkoski's Online Genus Database|authorlink =| coauthors =| year = 2002| url = http://strata.geology.wisc.edu/jack/showgenera.php?taxon=231&rank=class| accessdate = 2014-05-28}}
3. ^Schlegelmilch, R. (1992). Die Ammoniten des süddeutschen Lias: ein Bestimmungsbuch für Fossiliensammler und Geologen. Springer Spektrum.
4. ^Radstockiceras on the Paleobiology Database.

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