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Family Portunidae - Swimming Crabs

Leopard-spotted crab - Ovalipes ocellatus crab - Carcinus maenas Carcinus maenas - male Blue Crab - Callinectes sapidus tiny crab in tidepool - Carcinus maenas Arenaeus cribrarius Moss back Blueclaw - Callinectes - male Carcinus maenas
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Crustacea (Crustaceans)
Class Malacostraca (Malacostracans)
Superorder Eucarida (Eucarida (Crabs, Crayfish, Shrimp, etc.))
Order Decapoda (Crabs, Crayfishes, Lobsters, Prawns, and Shrimp)
Infraorder Brachyura (True Crabs)
Family Portunidae (Swimming Crabs)
Explanation of Names
Author: Rafinesque, 1815