Bopyridae

Rarity: Common

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What Wikipedia says

The Bopyridae are a family of isopod crustaceans in the suborder Cymothoida. There are 1223 individual species contained in this family. Members of the family are ectoparasites of crabs and shrimp. They live in the gill cavities or under the carapace where they cause a noticeable swelling.

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

Image: Die_Gartenlaube_(1877)_840.jpg: Ernst Keil's Nachfolger derivative work: Frédéric (talk), Public domain, via Wikimedia Commons.