Life (root) » Animalia (Animals) » Arthropoda (Arthropods) » Crustacea (Crustaceans) » Multicrustacea » Malacostraca (Malacostracans) » Eucarida (Eucarida (Crabs, Crayfish, Shrimp, etc.)) » Decapoda (Crabs, Crayfishes, Lobsters, Prawns, and Shrimp) » Pleocyemata » Brachyura (True Crabs) » Eubrachyura » Thoracotremata » Grapsoidea » Sesarmidae » Armases » Armases cinereum (Squareback Marsh Crab)