File:Reconstruction of Angistorhinus grandis (fossil reptile) (Late Triassic; Wyoming, USA) (35894291331).jpg

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Angistorhinus grandis Mehl, 1913 - reconstruction of a fossil reptile from the Triassic of Wyoming, USA. (public signage, Field Museum of Natural History, Chicago, Illinois, USA)

Prima facie, this looks like it is a crocodilian - but it's not! This is a phytosaur. Phytosaurs and crocodilians are unrelated reptiles that have similar body plans - an excellent example of convergent evolution. Phytosaurs are an extinct group of reptiles known only from Upper Triassic rocks, possibly extending into the Lower Jurassic.

From museum signage: With their long snouts and sharp teeth, phytosaurs looked, and perhaps behaved, like today's crocodiles. But scientists know that crocodiles did not evolve from these Triassic reptiles, because of some key differences. For example, a phytosaur's nostrils are between its eyes. (See the bumps on these skulls?) A crocodile's nostrils are at the tip of its snout.

Classification: Animalia, Chordata, Vertebrata, Reptilia, Phytosauria, Phytosauridae or Parasuchidae

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

en.wikipedia.org/wiki/Angistorhinus
Date
Source Reconstruction of Angistorhinus grandis (fossil reptile) (Late Triassic; Wyoming, USA)
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@N05/35894291331 (archive). It was reviewed on 1 March 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

1 March 2018

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current04:28, 1 March 2018Thumbnail for version as of 04:28, 1 March 20183,553 × 2,194 (5.04 MB)Sadads (talk | contribs)Transferred from Flickr via #file_candidates

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