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(Animals) any crustacean of the subclass or group Malacostraca, including lobsters, crabs, woodlice, sand hoppers, and opossum shrimps
(Zoology) of, relating to, or belonging to the Malacostraca
[C19: from New Latin, from Greek malakōstrakos, from malaco- + ostrakon shell]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌmæl əˈkɒs trə kən)

1. belonging or pertaining to the crustacean subclass Malacostraca, characterized by 20 body segments: includes lobsters, shrimps, and crabs.
2. a malacostracan crustacean.
[1825–35; « Greek, neuter pl. of malakóstrakos soft-shelled]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Evolution of the nauplius stage in malacostracan crustaceans.
This gland has been studied in many malacostracan crustaceans, including isopods and decapods, in order to improve the understanding of the reproductive mechanisms (Khalaila & Sagi, 1999).
The complete sequence of the mitochondrial genome of the crustacean Penaeus monodon: are malacostracan crustaceans more closely related to insects than to branchiopods?
The sequence of the zoeal description is based on the malacostracan somite plan and described from anterior to posterior.
"The shape [of the fossilized brain] matches that of a comparable sized modern malacostracan," the researchers said.
Native and alien malacostracan Crustacea along the Polish Baltic Sea coast in the twentieth century.
Embryos and nauplius larvae of the dendrobranchiate malacostracan Sicyonia ingentis were stained with fluorescent phallotoxins to study myogenesis.
Stomachs of juveniles leaving the rivers contained primarily gammaridean amphipods Corophium sp., and lesser amounts of crab megalopae, dipteran insects, other malacostracan crustaceans, and other insects.
Its burrows are also colonized by a series of extraordinary endemic invertebrates, such as the primitive syncarid malacostracan crustaceans Allanaspides helonomus and A.
The decapod caudal photoreceptor, identified by molecular, behavioral, and physiological techniques, is not thought to exist in other malacostracan crustaceans.
Scheduling of reproduction in relation to molting and growth in malacostracan crustaceans.