trochosphere
Troch"o*sphere, n. Etym: [Gr. sphere.] (Zoöl.) Defn: A young larval form of many annelids, mollusks, and bryozoans, in which a circle of cilia is developed around the anterior end.
Troch"o*sphere, n. Etym: [Gr. sphere.] (Zoöl.) Defn: A young larval form of many annelids, mollusks, and bryozoans, in which a circle of cilia is developed around the anterior end.