| 词条 | Euclastes |
| 释义 |
| name = Euclastes | fossil_range = Maastrichtian-Late Eocene ~{{fossil range|70|34}} |image= Euclastes.jpg | image_width = 250px |image_caption= E. platyops skull | regnum = Animalia | divisio = Amniota | phylum = Chordata | subphylum = Vertebrata | classis = Sauropsida | ordo = Testudines | subordo = Cryptodira | superfamilia = Chelonioidea | genus = Euclastes | genus_authority = Cope 1867 | subdivision_ranks = Species | subdivision =
| synonyms =
}}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,[1] while E. coahuilaensis named in 2009 was reassigned as Mexichelys coahuilaensis in 2010.[2][3] DescriptionUnlike 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. 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.[1] ClassificationSpecies
PhylogenyCladogram based on Lynch and Parham (2003)[1] and Parham and Pyenson (2010):[10]{{clade| style=font-size:100%;line-height:85%|label1=Cheloniidae sensu lato |1={{clade |1=Toxochelys |2={{clade |1=Mexichelys |2={{clade |1=Lophochleyinae |2={{clade |1=Euclastes |2={{clade |1=Argillochelys |2=Eochelone |3={{clade |1={{clade |1=Erquelinnesla |2=Pacifichelys}} |2={{clade |1=Puppigerus |2=Cheloniidae sensu stricto }} }} }} }} }} }} }} }} DistributionFossils of Euclastes have been found in:[11]
References1. ^1 2 {{cite journal |last=Lynch |first=S.C. |author2=Parham, J.F. |year=2003 |title=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 |journal=PaleoBios |volume=23 |issue=3 |pages=21–35 |url=http://www.seaturtle.org/PDF/Lynch_2003_PaleoBios.pdf }}{{dead link|date=September 2017 |bot=InternetArchiveBot |fix-attempted=yes }} 2. ^Euclastes coahuilaensis from the Paleobiology Database 3. ^Exibidos fósseis de tartarugas com 72 mi de anos 4. ^Euclastes acutirostris at Fossilworks.org 5. ^Euclastes melii at Fossilworks.org 6. ^Euclastes meridonalis at Fossilworks.org 7. ^Euclastes platyops at Fossilworks.org 8. ^1 2 3 {{cite journal |url=https://www.google.com/search?q=cache:l3WzdqSL2yQJ:jfparham.googlepages.com/2005Parham.pdf+Euclastes&hl=en&cd=8&gl=ca |title=A Reassesment of the Referral of Sea Turtle Skulls to the Genus Osteopygis |publisher=James F. Parham, University of California Museum of Paleontology; Journal of Vertebrate Paleontology |date=March 2005 |accessdate=2008-08-19}} 9. ^Euclastes wielandi at Fossilworks.org 10. ^{{Cite journal|author=James F. Parham; Nicholas D. Pyenson|year=2010|title=New Sea Turtle from the Miocene of Peru and the Iterative Evolution of Feeding Ecomorphologies since the Cretaceous|journal=Journal of Paleontology|volume=84|issue=2|pages=231–247|doi=10.1666/09-077R.1}} 11. ^Euclastes at Fossilworks.org External links
25 : Chelonioidea|Prehistoric turtle genera|Cretaceous–Paleogene boundary|Maastrichtian first appearances|Eocene genus extinctions|Cretaceous turtles|Paleocene turtles|Eocene turtles|Late Cretaceous reptiles of Africa|Fossils of Angola|Late Cretaceous reptiles of North America|Cretaceous United States|Fossils of the United States|Late Cretaceous reptiles of South America|Cretaceous Chile|Fossils of Chile|Paleogene reptiles of Africa|Fossils of Morocco|Paleogene reptiles of North America|Paleogene United States|Paleogene reptiles of South America|Paleogene Argentina|Fossils of Argentina|Fossil taxa described in 1867|Taxa named by Edward Drinker Cope |
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