File:Sea turtle skull 3.jpg

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English: (anterior view; Ohio State University Museum of Zoology)

The chelonians are the turtles and tortoises. They are an ancient group of reptiles that have 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. Chelonians occur in terrestrial, freshwater, brackish-water, and marine settings.

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

See info. at: en.wikipedia.org/wiki/Cheloniidae and

en.wikipedia.org/wiki/Turtle
Date Taken on 3 April 2019, 07:34:43
Source https://www.flickr.com/photos/47445767@N05/47575699921/
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@N05/47575699921. It was reviewed on 19 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

19 November 2020

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current22:14, 19 November 2020Thumbnail for version as of 22:14, 19 November 20202,400 × 2,221 (2.41 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/47575699921/ with UploadWizard

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