Malacostraca
plural noun
Mal·a·cos·tra·ca
ˌmaləˈkästrəkə
: a major subclass of Crustacea including most of the well-known marine, freshwater, and terrestrial members of the group (as lobsters, crabs, shrimps, sow bugs, beach fleas)
malacostracous
adjective
-kəs
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Merriam-Webster unabridged
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