Pygobranchia

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Pygobranchia \Py`go*bran"chi*a\, n. pl. [NL., fr. Gr. pugh` the
     rump + ? a gill.] (Zool.)
     A division of opisthobranchiate mollusks having the
     branchi[ae] in a wreath or group around the anal opening, as
     in the genus Doris.
     [1913 Webster]