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Euclastes is an extinct genus of sea turtles that survived the Cretaceous–Paleogene mass extinction . The genus was first named by Edward Drinker Cope in 1867, and contains three species. E. hutchisoni , was named in 2003 but has since been reassigned to the genus Pacifichelys ,[3] while E. coahuilaensis named in 2009 was reassigned as Mexichelys coahuilaensis in 2010.[4] [5]
Description
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E. platyops skull
Unlike the sea turtles Toxochelys and Eochelone , Euclastes has a secondary palate . However, the secondary palate of Euclastes is not as extensive as it is in Ctenochelys and Angolachelys .[6] The genus can be distinguished by later sea turtles based on its broad, low skull; broad, flat palate; wide, flat dentary bone with an elongated symphysis ; and low tomial ridge on the beak. The widened palate and dentaries give Eochelone wide, flat jaws suitable for crushing hard-shelled organisms.[3]
Classification
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Species
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†E. acutirostris Jalil et al. , 2009
†E. platyops Cope, 1867
†E. wielandi (Hay, 1908)
Phylogeny
[ edit ]
Cladogram based on Lynch and Parham (2003)[3] and Parham and Pyenson (2010):[7]
Distribution
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Fossils of Euclastes have been found in:[8]
Maastrichtian
Paleocene
Eocene
References
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^ a b c Lynch, S.C.; Parham, J.F. (2003). "The first report of hard-shelled sea turtles (Cheloniidae sensu lato ) from the Miocene of California, including a new species (Euclastes hutchisoni ) with unusually plesiomorphic characters" (PDF) . PaleoBios . 23 (3 ): 21–35. [permanent dead link ]
^ Euclastes coahuilaensis Archived 2012-10-17 at the Wayback Machine from the Paleobiology Database
^ Exibidos fósseis de tartarugas com 72 mi de anos
^ Mateus, Octávio; Jacobs, Louis; Polcyn, Michael; Schulp, Anne S.; Vineyard, Diana; Buta Neto, André; Telles Antunes, Miguel (December 2009). "The Oldest African Eucryptodiran Turtle from the Cretaceous of Angola" . Acta Palaeontologica Polonica . 54 (4 ): 581–588. doi :10.4202/app.2008.0063 .
^ James F. Parham; Nicholas D. Pyenson (2010). "New Sea Turtle from the Miocene of Peru and the Iterative Evolution of Feeding Ecomorphologies since the Cretaceous". Journal of Paleontology . 84 (2 ): 231–247. Bibcode :2010JPal...84..231P . doi :10.1666/09-077R.1 . S2CID 62811400 .
^ Euclastes at Fossilworks .org
^ Mateus, O., M. J. Polcyn, L. L. Jacobs, R. Arujo, A. S. Schulp, J. Marinheiro, B. Pereira and D. Vineyard. 2012. Cretaceous amniotes from Angola: dinosaurs, pterosaurs, mosasaurs, plesiosaurs, turtles. Actas de V Jornadas Internacionales sobre Paleontologia de Dinosaurios y su Entorno, Salas de los Infantes, Burgos 71-105
External links
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R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Euclastes&oldid=1235309250 "
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