Thalattosauria

Rarity: Common

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What Wikipedia says

Thalattosauria (Greek for "sea lizards") is an extinct order of marine reptiles that lived during the Triassic Period. Thalattosaurs were diverse in size and shape, and are divided into two superfamilies: Askeptosauroidea and Thalattosauroidea.

Excerpt from the Wikipedia article “Thalattosauria”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Nobu Tamura (http://spinops.blogspot.com), CC BY 3.0, via Wikimedia Commons.