Ostracoda
plural noun
Os·tra·co·da
| \ ˌästrəˈkōdə, äˈstrakədə\
Definition of Ostracoda
: a subclass of crustacea comprising small active mostly freshwater forms having the body enclosed in a bivalve shell composed of right and left valves, the body segmentation obscured, the abdomen rudimentary, and only seven pairs of appendages
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