Ctenosauriscidae

Rarity: Common

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At a glance

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What Wikipedia says

Ctenosauriscidae is an extinct family of pseudosuchian archosaurs within the clade Poposauroidea. Ctenosauriscids existed in Africa, Asia, Europe and North America during the Early Triassic to the Middle Triassic period (latest Olenekian to Anisian stages). All species had large "sails" on their backs.

Excerpt from the Wikipedia article “Ctenosauriscidae”, 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.