Malacostraca

English: lobsters, crabs, shrimp, etc.
Name: Malacostraca comes from Greek malakós meaning soft and óstrakon meaning shell.
Genera: 40000 species; 16 orders.
Region: cosmopolitan.
Habitat: all marine environments; freshwater and terrestrial.ZoologyMalacostraca display a great diversity of body forms and include crabs, lobsters, crayfish, shrimp, krill, woodlice, amphipods, mantis shrimp and many others. They are segmented animals, united by a common body plan comprising 20 body segments (rarely 21), and divided into a head, thorax, and abdomen.Malacostraca•• Subclass Phyllocarida
Leptostraca Claus, 1880
•• Subclass Hoplocarida
Stomatopoda Latreille, 1817
•• Subclass Eumalacostraca
Bathynellacea
Anaspidacea
Spelaeogriphacea
Thermosbaenacea
Lophogastrida
Amphipoda
Isopoda
Tanaidacea
Cumacea
Euphausiacea
Amphionidacea
Decapoda