the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Mollusca > [noun] > mollusc or shell-fish > larva (3)
A molluscan larva furnished with a velum or ciliated swimming-membrane. Also attributive.
a larval form constituting a stage in the development of most molluscs and of certain worms, esp. marine annelids, characterized by a spheroidal…