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Species Carcinus maenas - Green Crab

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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)
Genus Carcinus
Species maenas (Green Crab)
Synonyms and other taxonomic changes
Carcinus maenas (Linnaeus, 1758)
Five short notches along the rim of the carapace.
Native to the northeast Atlantic Ocean and Baltic Sea; now found on both North American coasts, as well as in South America, Australia, and Africa.
Often found with another invasive species, Hemigrapsus sanguineus.
Internet References