Jonah crab

Marine decapod crustacean. Crab with carapace approximately 2/3 as long as wide, surface coarsely granulate; front with 3 teeth, middle one exceeding others and depressed (flattened dorsoventrally); anterolateral margins divided into 9 quadrangular lobes or teeth with margins minutely denticulate. Pincers stout, nearly as long as second legs, carpus and hand with strong granulose rugae, upper margin of pincers denticulate. Color: red dorsally, yellow ventrally; back with 2 curved lines of yellowish spots and, behind middle, a figure somewhat resembling letter H; legs mottled and reticulated with yellow and red, more or less purplish. Maximum width of carapace for males is 175 mm, females 137 mm.