Malacostraca

(redirected from malacostracans)
Also found in: Dictionary, Thesaurus, Encyclopedia.

Malacostraca

the crustacean group containing crabs, lobsters, shrimps, crayfish, etc. See also CARIDOID FACIES.
Mentioned in ?
References in periodicals archive ?
The complete sequence of the mitochondrial genome of the crustacean Penaeus monodon: are malacostracan crustaceans more closely related to insects than to branchiopods?
We found that crab antennules, like those of other malacostracan crustaceans, take a discrete water sample during each flick by having a rapid downstroke, during which water flows into the aesthetasc array, and a slow recovery stroke, when water is trapped in the array and odorants have time to diffuse to aesthetascs.
Because the brain anatomy of branchiopods is much simpler than that of malacostracans, they have been regarded as the more likely ancestors of the arthropod lineage that would give rise to insects.
However, the research, published in the journal Nature, notes that the shape of the fossilised brain matches that of modern malacostracans.
Current state of freshwater malacostracans of Chile.
Crustaceans predominated at both intertidal sites; malacostracans were most abundant at I1 (44%), whereas cirripedes were most numerous at I2 (39%).
1986; Nussbaum and Dircksen, 1995) using the same antiserum that recognizes the N-terminal tetrapeptide sequence common to many AKHs (Schooneveld and Veenstra, 1985) have shown that RPCH-immunoreactive interneurons are very widely distributed in the brain, thoracic and stomatogastric ganglia, and ventral nerve cord in malacostracans.
Burnett (1984) postulated that the muscular DAA is a vestigial remnant of the tubular heart found in more primitive malacostracans, such as stomatopods.
However, some cases of non-functional hermaphroditism in males of gonochoristic species were also described in malacostracans (Charniaux-Cotton and Payen, 1985).