Trochophore

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

Bright-field microscope image of trochophore of annelid Pomatoceros lamarckii (family Serpulidae)

A trochophore (/ˈtroʊkəˌfɔər, ˈtrɒ-, -koʊ-/;^[1]^[2] also spelled trocophore) is a type of free-swimming planktonic marine larva with several bands of cilia.

By moving their cilia rapidly, a water eddy is created. In this way they control the direction of their movement. Additionally, in this way they bring their food closer, in order to capture it more easily.

Occurrence

Trochophores exist as a larval form within the trochozoan clade, which include the entoprocts, molluscs, annelids, echiurans, sipunculans and nemerteans. Together, these phyla make up part of the Lophotrochozoa; it is possible that trochophore larvae were present in the life cycle of the group's common ancestor.

Feeding habits

Trochophore larvae are often planktotrophic; that is, they feed on plankton.

Life cycle

SEM

Image of development of the annelid Pomatoceros lamarckii (family Serpulidae) showing the trochophore in images D-F

D - early trochophore
E - complete trochophore
F - late trochophore
G - metatrochophore

9-hour-old trochophore of the marine gastropod Haliotis asinina
sf - shell field

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External links

Bivalve anatomy

Shell	Callus Hinge line Hinge teeth Ligament Lira Lunule Nacre Pallial line Pallial sinus Periostracum Prodissoconch Resilifer Resilium Sculpture Umbo Valve Beak Annuli

Other hard parts	Byssus Pearl Sea silk

Soft parts	Adductor muscles Ctenidium Gastric shield Mantle Nephridium Siphon

Other	Abductin Glochidium Pseudofeces Trochophore Veliger

↑ "Trochophore". Oxford Dictionaries. Oxford University Press. Retrieved 2016-01-21.
↑ "Trochophore". Dictionary.com Unabridged. Random House. Retrieved 2016-01-21.

This article is issued from Wikipedia - version of the 6/29/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.