malacostracan

[mal-uh-kos-truh-kuhn]
adjective
1.
belonging or pertaining to the crustacean subclass Malacostraca, which includes the lobsters, shrimps, crabs, etc.
noun
2.
a malacostracan crustacean.

Origin:
1825–35; < Neo-Latin Malacostrac(a) order of crustacea (< Greek, neuter plural of malakóstrakos soft-shelled, equivalent to malak- malaco- + -ostrakos, adj. derivative of óstrakon shell (of mollusks, etc.); cf. ostracize) + -an

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Collins
World English Dictionary
malacostracan (ˌmæləˈkɒstrəkən)
 
n
1.  any crustacean of the subclass or group Malacostraca, including lobsters, crabs, woodlice, sand hoppers, and opossum shrimps
 
adj
2.  of, relating to, or belonging to the Malacostraca
 
[C19: from New Latin, from Greek malakōstrakos, from malaco- + ostrakon shell]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

malacostracan

any member of the 22,000 species of the class Malacostraca (subphylum Crustacea), a widely distributed group of marine, freshwater, and terrestrial invertebrates.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Toxicity of some insecticides to four species of malacostracan crustaceans.
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