Lewisuchus admixtus
By Scott Reid on @drawingwithdinosaurs
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Name: Lewisuchus admixtus
Name Meaning: Lewi Crocodile
First Described: 1972
Described By: Romer
Classification: Avemetatarsalia, Ornithodira, Dinosauromorpha, Dinosauriformes, Silesauridae
Lewisuchus is a Silesaurid that is probably synonymous with Pseudolagosuchus, having been treated as synonymous in much of the literature, but never fully confirmed as synonymous in studies (i.e., one study indicated they are probably synonymous, other studies since have just treated it as such without rigorously testing it). To be fair, of course, it cannot be rigorously tested, as they don’t have very much overlapping material! It was found in the Chañares Formation of Argentina, living about 236 to 234 million years ago, in the Ladinian age of the Middle Triassic. It was about one meter long, and would have been a lithe, quadrupedal animal, like other Silesaurids.
Source:
https://en.wikipedia.org/wiki/Lewisuchus
Shout out goes to @mandasaurodon!