Malacostraca

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Malacostraca

[‚mal·ə′kä·strə·kə]
(invertebrate zoology)
A large, diversified subclass of Crustacea including shrimps, lobsters, crabs, sow bugs, and their allies; generally characterized by having a maximum of 19 pairs of appendages and trunk limbs which are sharply differentiated into thoracic and abdominal series.