Pilumnoidea

Rarity: Common

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What Wikipedia says

Pilumnoidea is a superfamily of crabs, whose members were previously included in the Xanthoidea. The three families are unified by the free articulation of all the segments of the male crab's abdomen and by the form of the gonopods. The earliest fossils assigned to this group are of Eocene age.

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

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