lophophore


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Related to lophophore: trochophore

Lophophore

The crown of tentacles which surrounds the mouth in the Bryozoa, Phoronida, and Brachiopoda. The numerous ciliated tentacles arise from a circular or horseshoe-shaped fold of the body wall. The tentacles are hollow outgrowths of the body wall, each containing fluid-filled extensions of the body cavity and extended hydraulically. The primary function of the lophophore is to gather food. On the tentacles are ciliary tracts which drive a current of food-particle-bearing water through the lophophore. While the lophophore is primarily a feeding organ, it may also play a role in reproduction, respiration, and larval locomotion. See Brachiopoda, Bryozoa, Phoronida

McGraw-Hill Concise Encyclopedia of Bioscience. © 2002 by The McGraw-Hill Companies, Inc.

lophophore

[′läf·ə‚fȯr]
(invertebrate zoology)
A food-gathering organ consisting of a fleshy basal ridge or lobe, from which numerous ciliated tentacles arise; found in Bryozoa, Phoronida, and Brachiopoda.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In the first 2 days after metamorphosis, juvenile slugs were observed repeatedly placing their mouths over the lophophores of bryozoans.
Each zooid bears a crown of tentacles (lophophores), which form a tightly packed canopy over the colony (Fig.
These two models complement each other in that one (Grunbaum, 1995) concentrates more on what happens to the flow below the lophophore canopy, while the other (Eckman and Okamura, 1998) focuses more on the flow above the colony.
The ITO is oriented with its distal pore directed away from the funnel of the lophophore. Consequently, spermatozeugmata within lophophores cannot be oriented to enter maternal individuals unless they develop a bend.
Once within the lophophore region they gain access to maternal zooids through specialized intertentacular organs of the lophophore, and subsequently effect internal fertilization of eggs within maternal zooids (Temkin, 1994).
Under natural conditions with light from above, the colony is oriented with its frontal surface and lophophore facing away from the water surface; thus, the colony is shielded from the downward flux of particulate matter.
Alternatively, separating the two shell valves removes the ventral ovaries from the lophophore and viscera, because these organs invariably remain attached to the dorsal valve.
The similarity between the feeding apparatus of pterobranchs and the lophophore of bryozoans, brachiopods, and phoronids has long been known; the earliest reports on the pterobranchs considered them either related to, or included in, the Bryozoa (13-15).
In the latter case their possible lophophores must have been rather small.
(1) In contrast to the bivalves, the open constructions of the brachiopods lophophores prevent from clogging with sediment particles in a high-energy environment.
Newly metamorphosed colonies can be aged, because it takes approximately one day for metamorphosis to proceed from initial settlement of the larvae to development of feeding lophophores in the twinned initial zooids of the colony.
Since all brachiopods feed with lophophores, the feeding strategies of different species are similar.