McLaughlin, Patsy A. Shannon Point Marine Center, Western Washington University, Anacortes, Washington.
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An order of the subclass Myodocopa, class Ostracoda, characterized by biramous antennae with the endopod and exopod of similar size, reduction or absence of the seventh pair of appendages, an unpaired male copulatory organ, and the absence of a median eye. The taxon is subdivided into two suborders, Halocypridina and Cladocopina; each has both Recent and fossil representatives. Extant halocyprids (see illustration) are small ostracods, measuring less than 0.4 in. (10 mm). The shell, which may be smooth or ornamented, may be strongly calcified or soft and may or may not bear a rostrum at its anterior end. The two orders exhibit major differences. The Halocypridina possess a uniramous maxillule, whereas that of the Cladocopina is distinctly biramous. The seventh pair of appendages is reduced to one or two segments and a pair of bristles in the Halocypridina, but the sixth pair is elongate; in the Cladocopina both the sixth and seventh pairs are absent. A heart may or may not be present in the halocypridinids, but it is totally absent in cladocopinids. Differences are also evident in the mandible and armature of the caudal furca.
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