trochophore

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trochophore

(trŏk′ə-fôr′)
n.
The small, free-swimming, ciliated aquatic larva of various invertebrates, including certain mollusks and annelids.

trochophore

or

trachosphere

the characteristic larva of polychaet worms, molluscs and some other invertebrates. It is more or less spherical, with a pre-oral ring of cilia called the prototroch.
References in periodicals archive ?
Abalone larvae generally exhibit positive phototaxis during trocophore stage (Ino 1952, Yano & Ogawa 1977, Tanaka 1978) (but see Leighton 1989), indicating upward swimming behavior.
2003 Iwao 2008 Fertilized egg na na na Cleavage (4-cell stage) 1-2 h na na Advanced embryo 6 h na na (8-cell stage) Prehatched out larvae 12-14h na na Hatched trocophore larvae na 10 h 8 h 25 min at 23.
Pink abalone eggs are negatively buoyant; the trocophore larvae, shortly after hatching (12-18 h), swim to the surface (negative geotaxis), complete larval development within 4-17 days, and then begin settlement (Leighton 1974, Leighton 2000).