ostracoderm ous (ostrakodermus)

[As ostracoderm + -ous.] Same as ostracoderm. ostracodous (os'tra-kō-dus), a. [As ostracode +-ous.] Same as ostracode. Ostracopoda (os-tra-kop'ō-da), n. pl. [NL., mented; a rudimentary abdomen; a very small shell-gland; the body not ringed, ending in a bifid tail; very few thoracic appendages (generally two or three), not foliaceous, but cylindroid, like the legs of higher crustaceans; branch iæ attached to the oral appendages; eyes, when present, median and coalesced or lateral and separate; and antennules and antennæ large and subserving locomotion. The Ostracopoda are mostly minute fresh-water crustaceans, swimming very actively by means of their antennæ; some carry their eggs about with them like ordinary Crustacea, but attach them as panostaa foreign mubstances aquatic strata from the earlier Paleozoic formations, and appear to have undergone little modification. There are several families and a number of genera, such as Cypris and Cythere. Also called Ostracod a and Ostrapoda. See cuts under Cypris and Cythereida.