- blue crab - Atlantic crab; most common source of fresh crabmeat
--1 is a kind of crab, crabmeat
--1 is a part of blue crab, Callinectes sapidus- blue crab, Callinectes sapidus - bluish edible crab of Atlantic and Gulf coasts of North America
--2 is a kind of swimming crab
--2 is a member of Callinectes, genus Callinectes
--2 has parts: blue crab - blue crab, Callinectes sapidus - bluish edible crab of Atlantic and Gulf coasts of North America