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Seymouria
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Seymouria

fossil animal genus
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Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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History

Seymouria, extinct genus of terrestrial tetrapod found as fossils in Permian rocks (251 million to 299 million years old) in North America and named for fossil deposits near Seymour, Texas. Seymouria had many skeletal characteristics in common with amniotes (reptiles, mammals, and certain sets of their more primitive relatives), but it is not included in this group. Some seymouriamorphs pursued an almost exclusively aquatic life, whereas others, such as the genus Diadectes, became early terrestrial...

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