Phyllocarida

Rarity: Common

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At a glance

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What Wikipedia says

Phyllocarida is a subclass of crustaceans, comprising the extant order Leptostraca and the extinct orders Hymenostraca and Archaeostraca. This clade of marine crustaceans diversified extensively during the Ordovician.

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

Image: Hans Hillewaert, CC BY-SA 4.0, via Wikimedia Commons.