[Kingdom] Animalia Linnaeus, 1758 - animals Grade Enterozoa Grade Cœlomata Phylum Appendiculata {Lankester} Branch Gnathopoda Straus-Durkheim, 1829 Grade Condylopoda Class Crustacea Brünnich, 1772 - crustaceans see Superclass Crustacea Pennant, 1777 Grade Malacostraca Latreille, 1802 Branch Arthrostraca Order Amphipoda Latreille, 1816 - amphipods Genus Gammarus Fabricius, 1775