File:Dinochelys whitei (fossil turtle shell) (Morrison Formation, Upper Jurassic; Dinosaur National Monument, Utah, USA) 1 (48816088801).jpg

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Dinochelys whitei Gaffney, 1979 - fossil turtle (cast of holotype) from the Jurassic of Utah, USA. (DNM 986, Dinosaur National Monument, Utah)

The chelonians are the turtles and tortoises. They are an ancient group of reptiles with a Triassic to Holocene stratigraphic record. Turtles are most easily recognized by their shell - some forms can retract the head & limbs into the shell when threatened, while other species cannot. Their overall body plan has changed very little since the Triassic - a great example of conservative evolution (but see the transitional fossil turtle Odontochelys semitestacea - <a href="https://en.wikipedia.org/wiki/Odontochelys" rel="noreferrer nofollow">en.wikipedia.org/wiki/Odontochelys</a>). Chelonians occur in terrestrial, freshwater, brackish-water, and marine settings.

Classification: Animalia, Chordata, Vertebrata, Reptilia, Anapsida, Testudines, Pleurosternidae

Stratigraphy: Carnegie Quarry Sandstone, Brushy Basin Member, Morrison Formation, Kimmeridgian Stage, Upper Jurassic, ~150 to 156 Ma

Locality: Carnegie Quarry, Dinosaur National Monument, northern Uintah County, northeastern Utah, USA

See info. at: <a href="https://en.wikipedia.org/wiki/Cheloniidae" rel="noreferrer nofollow">en.wikipedia.org/wiki/Cheloniidae</a> and <a href="https://en.wikipedia.org/wiki/Turtle" rel="noreferrer nofollow">en.wikipedia.org/wiki/Turtle</a> and

<a href="https://www.nps.gov/dino/learn/nature/dinochelys-whitei.htm" rel="noreferrer nofollow">www.nps.gov/dino/learn/nature/dinochelys-whitei.htm</a>
Date Taken on 9 June 2012, 13:14
Source Dinochelys whitei (fossil turtle shell) (Morrison Formation, Upper Jurassic; Dinosaur National Monument, Utah, USA) 1
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/48816088801 (archive). It was reviewed on 8 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

8 October 2019

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current00:42, 8 October 2019Thumbnail for version as of 00:42, 8 October 20192,195 × 3,335 (5.59 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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