| 词条 | Polyptychodon |
| 释义 |
|name = Polyptychodon |fossil_range = Late Cretaceous, {{fossil range|101|89.3}} |image = Polyptychodon.jpg |image_width = 250px | image_caption = P. interruptus jaw with tooth |regnum = Animalia |phylum = Chordata |classis = Sauropsida |ordo = Plesiosauria |subordo = Pliosauroidea |familia = Pliosauridae |genus = Polyptychodon |genus_authority=Owen, 1841[1] |subdivision_ranks=Species |subdivision=
}} Polyptychodon (meaning 'shaped fin tooth') is a genus of pliosaurid found Middle-Late Cretaceous marine deposits in southern England. It has been considered a nomen dubium in a 2016 review. History of discoveryThe type species, P. interruptus is known from an isolated tooth from the Late Cretaceous Chalk Group of southern England.[1] Owen described a second nominal species of the genus, P. continuus, from an isolated tooth collected in the Hythe Formation of Maidstone, Kent. (The macronarian sauropod Dinodocus was mistakenly thought to be conspecific with P. continuus before it was correctly recognized as a dinosaur and not a plesiosaur.) Numerous pliosaurid teeth and vertebrae from England and eastern France have been previously assigned to Polyptychodon, including isolated vertebrae from France which were misidentified as a sauropod.[2] Comparison between Albian-age isolated vertebrae from marine deposits in France and Kronosaurus suggested a size of approximately {{convert|7|m|ft}} for a Polyptychodon-like brachaucheniine pliosaurid.[2] However, a 2016 re-evaluation found Polyptychodon and its types species to be dubious, and that numerous remains from the Chalk Group in England that had been referred to the genus most likely represent different species of plesiosaurs, with some teeth possibly being referable to Polycotylidae.[3] Similar fossils of pliosaurs were found also in Czech Republic.[4] Misassigned speciesPolyptychodon hudsoni (holotytpe, SMU 60313) was described from the Turonian-age Eagle Ford Formation of Dallas, Texas.[5][6]See also{{Portal|paleontology}}
References1. ^1 2 Owen R. (1840-1845 [1841]). Odontography. Hippolyte Baillière, London, 655 p. 2. ^1 Buffetaut E, Colleté C, Dubus B, Petit J-L. 2005. The "sauropod" from the Albian of Mesnil-Saint-Père (Aube, France): a pliosaur, not a dinosaur. Association Géologique Auboise, Bulletin Annuel, Sainte-Savine 26: 3-8. 3. ^Madzia D. (2016) A reappraisal of Polyptychodon (Plesiosauria) from the Cretaceous of England. PeerJ 4:e1998 https://doi.org/10.7717/peerj.1998 4. ^http://dinosaurusblog.com/2015/07/13/druhohorni-plazi-v-cechach-ii/ 5. ^Welles SP, Slaughter BH. 1963. The first record of the plesiosaurian genus Polyptychodon (Pliosauridae) from the New World. Journal of Paleontology 37 (1):131-133. 6. ^"Plesiosaur Unearthed During Preliminary Excavation for the Dallas-Fort Worth International Airport" External links
6 : Late Cretaceous plesiosaurs of Europe|Cenomanian genus first appearances|Turonian genus extinctions|Fossil taxa described in 1841|Taxa named by Richard Owen|Nomina dubia |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。