Malacostraca

From Academic Kids

Malacostraca
Eophreatoicus
Eophreatoicus
(a fresh water isopod from Australia)
Scientific classification
Kingdom:Animalia
Phylum:Arthropoda
Subphylum:Crustacea
Class:Malacostraca

Latreille, 1802

Orders

Subclass Eumalacostraca
 Superorder Eucarida
  Order Amphionidacea
  Order Decapoda - crabs, shrimp
  Order Euphausiacea - krill
 †Superorder Pancarida
  †Order Thermosbaenacea
 Superorder Peracarida
  Order Amphipoda - amphipods
  Order Cumacea - cumaceans
  Order Isopoda - pillbugs, sowbugs
  Order Lophogastrida
  Order Mictacea
  Order Mysidacea
  †Order Spelaeogriphacea
  Order Tanaidacea
 Superorder Syncarida
  Order Anaspidacea
  Order Bathynellacea
  †Order Palaeocaridacea
  Order Stygocaridacea

Subclass Hoplocarida
  Order Stomatopoda - mantis shrimp

Subclass Phyllocarida
  †Order Archaeostraca
  †Order Hoplostraca
  Order Leptostraca

The Malacostraca are the largest subgroup of crustaceans and include most of the animals that non-experts recognise as crustaceans, such as the decapods (such as crabs, mole crabs, lobsters and true shrimps), the stomatopods or mantis shrimps, and krills. They also include the huge group of amphipods, and the only substantial group of land-based crustaceans, the isopods (woodlice or sowbugs and related species). With more than 22'000 members, this group represents two third of all crustacean species and contains all the larger forms. It first appeared in the Cambrian.

The classification of crustaceans is currently being debated, and the Malacostraca are regarded by some authors as a class and by others as a subclass.

Morphology

Their characteristics include:

  • The head has 6 segments, with a pair of antennules and a pair of anntennae, as well as mouthparts.
  • They have 5 pairs of walking legs, with the first often modified to form pincers.
  • There are 8 thoracic segments. The cephalothorax is covered by a carapace form via fusion of 3 of them, letting the 5 other uncovered.
  • The abdomen is behind and often used for swimming. There are 6 abdominal segments.
  • There are appendages near the mouthparts, these are called maxillipeds.
  • They have compound stalked or sessile eyes.
  • They have two-chambered stomach.
  • They have a centralised nervous system.da:Storkrebs

fr:Malacostracés pl:Pancerzowce sv:Storkräftor

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