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n. pl.1.(Zool.) An order of Crustacea, including Nebalia and allied forms.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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This included a bunch of very small animals like tanaids, gnathiid isopods, leptostracans, pink and yellow fish, green moray eels, yellow hermit crabs as well as twisted black wire coral measuring up to two meters high, sea urchins, sea fans, and dozens of new algae species.
Adult eumalacostracans possess only six pleonic ganglia (see Hanstrom, 1928), and this is also true for leptostracans with a seventh pleomere (Claus, 1888; Manton, 1928a).
While scuba diving, Vetter discovered teeming populations of leptostracans -- small, shrimplike invertebrates -- and amphipods in this detritus.