Peracarida
Eophreatoicus (a fresh water isopod from Australia)
Scientific classification
Kingdom: Animalia Phylum: Arthropoda Subphylum: Crustacea Class: Malacostraca Subclass: Eumalacostraca Superorder: Peracarida Calman, 1904
Orders
Amphipoda Cumacea Isopoda Lophogastrida Mictacea Mysidacea Spelaeogriphacea Tanaidacea Thermosbaenacea

The superorder Peracarida is a large group of crustaceans, having members in marine, freshwater, and terrestrial habitats. For a topic outline on this subject see List of basic Australia topics. Arthropods are Animals belonging to the Phylum Arthropoda (from Greek ἄρθρον arthron, " Joint " Structure of crustaceans As Arthropods crustaceans have a stiff Exoskeleton, which must be shed to allow the animal to grow ( Ecdysis or molting The Malacostraca (Greek "soft shell" are the largest class of Crustaceans and include most of the animals that non-experts recognize as crustaceans including The Eumalacostraca (Greek "true soft shell" are a subclass of Crustaceans containing almost all living Malacostracans about 22000 described species William Thomas Calman ( December 29 1871 - September 29 1952) was a Scottish Zoologist, specialising in the Crustacea Amphipoda (amphipods are an order of animals that includes over 7000 described Species of Shrimp -like Crustaceans ranging from 1 mm to 140 mm Cumacea is an order of small marine Crustaceans occasionally called hooded shrimps. Isopods are one of the most diverse orders of Crustaceans with many species living in all environments but are most common in shallow marine waters The Mysidacea is a group of small Shrimp -like creatures comprising the two related orders Mysida and Lophogastrida. Mictacea is the most recently established order of Crustaceans erected for five species of small Shrimp -like Animals of the deep sea and The Mysidacea is a group of small Shrimp -like creatures comprising the two related orders Mysida and Lophogastrida. Spelaeogriphacea is an order of Crustaceans that grow to no more than 10  mm. Tanaids ( order Tanaidacea) make up a minor Crustacean group within the class Malacostraca. Thermosbaenacea is a group of Crustaceans that live in Thermal springs in Fresh water, Brackish water and Anchialine Structure of crustaceans As Arthropods crustaceans have a stiff Exoskeleton, which must be shed to allow the animal to grow ( Ecdysis or molting They are defined by the possession of a single pair of maxillipeds (rarely 2–3), of mandibles with an articulated accessory process between the molar and incisor teeth in the adults (called the lacinia mobilis), of a carapace which is often reduced in size and is not fused with the posterior thoracic somites. The decapod Crustacean such as a crab lobster shrimp or prawn is made up of nineteen Body segments grouped into two main body parts the Cephalothorax The mandible (from Latin mandibula, "jawbone" or inferior maxillary bone forms the lower Jaw and holds the lower teeth in place A carapace is a dorsal section of an Exoskeleton or shell in a number of animal groups In all orders except the Thermosbaenacea, where the carapace is used to brood eggs, the basalmost segments of the legs bear thin flattened plates (oostegites) which enclose a ventral brood pouch, known as a marsupium. The arthropod leg is a form of jointed Appendage of Arthropods usually used for Walking. The marsupium or brood pouch, in Peracarida such as Amphipods Isopods or Cumaceans is an egg chamber formed by the ventral plates The young hatch at a post-larval, prejuvenile stage called a manca which lacks the last pair of legs.

General bauplan of a peracarid mandibula: 1. A body plan, or bauplan, is essentially the blueprint for the way the body of an organism is laid out Molar process; 2. Spine row; 3. Lacinia mobilis; 4. Incisor process; 5. Palp

References

• W. T. Calman (1904). William Thomas Calman ( December 29 1871 - September 29 1952) was a Scottish Zoologist, specialising in the Crustacea "On the Classification of the Crustacea Malacostraca". The Annals and Magazine of Natural History, including Zoology, Botany, and Geology 13 (74): 144–158.  
• Martin, J. W. & Davis, G. E. (2001). An Updated Classification of the Recent Crustacea. Natural History Museum of Los Angeles County, 132 pp. .  

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