Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Class Malacostraca - Malacostracans

Asian Shore Crab - Hemigrapsus sanguineus Northern crayfish - Orconectes virilis Hermit crab - Pagurus longicarpus Shrimp European Sowbug - Oniscus asellus Sandhopper - Americorchestia megalophthalma Opossum Shrimp - female Mantis Shrimp
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Crustacea (Crustaceans)
Class Malacostraca (Malacostracans)
~40,000 spp, worldwide, including approximately:
15,000 spp. in order Decapoda
10,000 spp. in order Isopoda
9,500 spp. in order Amphipoda(1)
The largest class of Crustacea. The vast majority of species are marine but the class also includes many freshwater and terrestrial species. The freshwater fauna includes mostly members of Amphipoda, Isopoda, and Decapoda, while the terrestrial fauna is dominated by isopods, about 5,000 species of which are terrestrial.
Works Cited