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Pygobranchia
Pygobranchia Py`go*bran"chi*a, n. pl. [NL., fr. Gr. pugh` the
rump + ? a gill.] (Zo["o]l.)
A division of opisthobranchiate mollusks having the
branchi[ae] in a wreath or group around the anal opening, as
in the genus Doris.
Meaning of Pygobranchia from wikipedia
