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(invertebrate zoology)
A mollusk larval stage following the trochophore, distinguished by an enlarged girdle of ciliated cells (velum).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the larvae of many marine mollusks, similar to the trochophore (only Dreissensia among the freshwater mollusks). The veliger has a “leg,” an intestine, an eye, organs of equilibrium (statocysts), an embryonic shell (protoconch) into which the anterior part of the body is drawn in case of danger, and a velum—one, two, or more complexly dissected lobes covered with cilia and used for locomotion and capture of food. Certain veligers stay suspended in the water a long time, and within several weeks they travel with the current throughout the Atlantic Ocean. After settling to the bottom, the veliger is transformed into an adult mollusk.

V. A. SVESHNIKOV 4-1105-3]

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
fuscus veligers stopped growing as early as 235 gm in length and 32 days from hatching.
Oxygen consumption rate of veligers and early postsettlement individuals of Haliotis rufescens was not affected by densities from 22 to 911 ind/ml and 44 to 243 ind/ml, respectively (Shilling et al.
Generally, the larval development of molluscs started with a basic stage of trochophore and then progressively develop into lecithotrophic or planktotrophic veliger larvae, which are characterized by the formation of the velum.
Studies in the functional anatomy of some British monotocardian veligers, with observations on the musculature of the buccal mass of Littorina littorea (L.) Ph.D.
The date and time of hatching were recorded for each egg mass, and the proportion of hatchlings that were veligers or crawl-away juveniles was determined as described above.
Mean survival of each larval stage was 58.8%, 20, 60%, and 100% for D veligers, umbo veligers, pediveligers, and juveniles (up to 84 days), respectively.
In general, these studies highlight the importance of temperature and availability of food on activation and extent of gametogenesis, and identify critical moments when larval mortality increases, such as the start of exogenous feeding by early veliger larvae and metamorphosis of pediveliger larvae.
galbana per milliliter, far exceeding concentrations that Sprung (1984) found to be satiating for veligers of Mytilus edulis.
The development of Echinolittorina lineolata can be considered "mixed," because early stages of development are contained within egg capsules (i.e., development is lecithotrophic during the encapsulated stage), whereas the hatched veligers are planktonic.
Leprotintinnus nordgvistii, Acartia clausi, Mesochra rapiens, Microsetella norvegica, Cypridina mediterrianea, Sagitta friderici, Medusa of Obelia spp., and Molluscs Lamellibranch veligers) were recorded in high frequencies at sector A.
Spatial variation in the density and settling of dreissenid mussel veligers has been documented in several locations.