amphitrocha

from The Collaborative International Dictionary of English v.0.48

Amphitrocha \Am*phit"ro*cha\ ([a^]m*f[i^]t"r[-o]k[.a]), n. [NL.,
   fr. Gr. 'amfi` + trocho`s a wheel.] (Zool.)
   A kind of annelid larva having both a dorsal and a ventral
   circle of special cilia.
   [1913 Webster] Amphitropal