Veliger

·noun Any larval gastropod or bivalve mollusk in the state when it is furnished with one or two ciliated membranes for swimming.

veliger
vēlĭger, gĕra, gĕrum, adj. [velumgero], sail-bearing , covered with sails : mare, Cassiod. Var. 7...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.