A cyphonautes is a larva of an ectoprocta bryozoan. Its resemblance to the actinotrocha larva of a phoronid seems to show relationship between them. ... Found on http://en.wikipedia.org/wiki/Cyphonautes
Cyph`o·nau'tes noun [ New Latin , from Greek ......... bent + ............ sailor.] (Zoology) The free-swimming, bivalve larva of certain Bryozoa. Found on http://www.encyclo.co.uk/webster/C/211