Eryops

The Eryops that appeared in "Distant Origin" more closely resembles the Gorgonops, a type of synapsid, which were the ancestors of mammals, not dinosaurs. Also, Eryops lived in the Permian period, not the Devonian, i.e., some 100 million years later.

The Eryops was a sculpture made by Jordu Schell. ("Red Alert: Amazing Visual Effects", VOY Season 3 DVD special feature)