Asiphonea

{ ‖As′i‐pho″ne‐a (�), ‖A‐si′pho‐na″ta (�), ‖As′i‐phon″i‐da (�), } n. pl. [NL., fr. Gr. ἀ priv. + � a tube.] (Zoöl.) A group of bivalve mollusks destitute of siphons, as the oyster; the asiphonate mollusks.