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For Insects, Spiders & Their Kin
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Infraorder Brachyura - True Crabs

Carcinus maenas - male Cancer irroratus Mangrove tree crab? - Aratus pisonii Crab in the mud A group of crabs - Uca pugilator Menippe - Menippe mercenaria Menippe - Menippe mercenaria Callinectes sapidus
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)
Explanation of Names
From Greek, meaning short tail.
Author: Latreille, 1802
Internet References