trochophore
A - episphere
B - hyposphere
1 -
ganglia
2 - apical tuft
3 - prototroch
4 - metatroch
5 - nephridium
6 - anus
7 - proto
nephridia
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,
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) showing trochophore on images D-F.
D - early trochophore
E - complete trochophore
F - late trochophore
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