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crab
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Puget Sound king crab (Lopholithodes mandtii) with a spiny, red and orange shell and legs, resting on a rocky underwater surface.
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Puget Sound king crab (Lopholithodes mandtii) with a spiny, red and orange shell and legs, resting on a rocky underwater surface.
Puget Sound king crab Puget Sound king crab (Lopholithodes mandtii), a lithodid (“stone”) crab, Anomura group

crab

crustacean
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crab, any short-tailed member of the crustacean order Decapoda (phylum Arthropoda)—especially the brachyurans (infraorder Brachyura), or true crabs, but also other forms such as the anomurans (suborder Anomura), which include the hermit crabs. Decapods occur in all oceans, in fresh water, and on land; about 10,000 species have been described. Unlike those of other decapods (e.g., shrimp, lobster, crayfish), crabs’ tails are curled under the thorax, or midsection. The carapace (upper body shield) is usually...

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