Malacostraca

class of crustaceans Crustaceans (Malacostraca) is a class of organisms united by key anatomical and physiological traits. It contains 6 orders with 308 known species. This includes the order groups Amphipoda, Anaspidacea, Decapoda, Euphausiacea, Isopoda, and Mysida. Among its members, 28 species are currently classified as threatened (Critically Endangered, Endangered, or Vulnerable). It belongs to Arthropods (Arthropoda).