Malacostraca

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Malacostraca

the crustacean group containing crabs, lobsters, shrimps, crayfish, etc. See also CARIDOID FACIES.
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Antennules are olfactory organs involved in detection of odorants that stimulate upstream locomotion and tracking of distant odor sources by diverse malacostracan crustaceans (e.g., Devine and Atema, 1982; Atema, 1998; Mead, 2002; Mead et al., 2003; Weissburg et al., 2012; Moore and Kraus-Epley, 2013).
These characteristics are highly divergent from the body plan of other malacostracan crustaceans; therefore, Caprellidea are of great interest for understanding the evolution of morphological novelty.
The origin and biogeography of Malacostracan crustaceans in the deep sea.