The Collaborative International Dictionary
Actinotrocha
Actinotrocha \Ac`ti*not"ro*cha\, n. pl. [NL.; Gr. ?, ?, a ray + ? a ring.] (Zo["o]l.) A peculiar larval form of Phoronis, a genus of marine worms, having a circle of ciliated tentacles. [1913 Webster] ||
Wiktionary
actinotrocha
n. The larva of a phoronid.