Matutidae

Rarity: Common

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At a glance

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What Wikipedia says

Matutidae is a family of crabs, sometimes called moon crabs, adapted for swimming or digging. They differ from the swimming crabs of the family Portunidae in that all five pairs of legs are flattened, rather than just the last pair, as in Portunidae. Crabs in the Matutidae are aggressive predators.

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

Image: ふうけ, CC BY-SA 3.0, via Wikimedia Commons.