Trochophore

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trochophore
A - episphere
B - hyposphere
1 - ganglia
2 - apical tuft
3 - prototroch
4 - metatroch
5 -
6 - anus
7 - protonephridia
8 - gastrointestinal tract
9 - buccal opening
10 - blastocoele

A trochophore (or trocophore) is a type of larva with several bands of cilia. They are found in the trochozoan phyla, which include the entoprocts, nemerteans, mollusks, annelids, echiurans, and sipunculans. Together, these make up part of the Lophotrochozoa; it is possible that trochophore larvae were present in the life cycle of the group's common ancestor. Trochophore larvae are often planktotrophic; that is, they feed on plankton.

Ontogeny of Polyplacophora: First image is trochophore, second is stadium in metamorphosis, third is juvenile Polyplacophora.

SEM image of development of annelid Pomatoceros lamarckii (family Serpulidae) is showing trocophore on images D-F.
D - early trochophore
E - complete trochophore
F - late trochophore