Noun
English Wikipedia has an article on:trochophoreWikipedia
trochophore (plural trochophores)
(biology) The free-swimming larva of some invertebrates that have a circlet of cilia
Although some species hatch directly into the adult form, many have a trochophore larva, which metamorphoses into the adult after anything from a day to a month, depending on species. Source: Internet
Fertilized eggs hatch into free-swimming trochophore larvae. Source: Internet