Branchiopoda

from The Century Dictionary.

• noun An order of entomos-tracous crustaceans containing the Phyllocarida, Phyllopoda, Cladocera, and Branchiura.
• In Latreille's system of classification, the first order of his Entomostraca, characterized as having a mouth composed of an upper lip, two mandibles, a tongue, and one or two pairs of maxillæ, and the branchiæ more or less anterior: so called because their branchiæ or gills are situated on the feet.
• As defined by Huxley, a group of entomostracous Crustacea, embracing only the two groups Phyllopoda and Cladocera.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) An order of Entomostraca; -- so named from the feet of branchiopods having been supposed to perform the function of gills. It includes the fresh-water genera Branchipus, Apus, and Limnadia, and the genus Artemia found in salt lakes. It is also called Phyllopoda. See phyllopoda, cladocera. It is sometimes used in a broader sense.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• proper noun A taxonomic class within the subphylum Crustacea — any shrimps.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun primitive aquatic mainly freshwater crustaceans: fairy shrimps; brine shrimps; tadpole shrimps; can shrimps; water fleas