Prosobranchia


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Related to Prosobranchia: Opisthobranchia, Pulmonata

Prosobranchia

[‚prä·sə′braŋ·kē·ə]
(invertebrate zoology)
The largest subclass of the Gastropoda; generally, respiration is by means of ctenidia, an operculum is present, there is one pair of tentacles, and the sexes are separate.
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 It might be outdated or ideologically biased.

Prosobranchia

 

a subclass of gastropod mollusks, sometimes divided into three independent subclasses. The shell is usually coiled and sometimes conical; very rarely is there no shell. An operculum that covers the mouth of the shell is usually situated on the dorsal side of the foot. The organs in the mantle cavity (gills, osphradia, anus, and openings of the kidneys and gonads) are displaced anteriorly; hence the gills are in front of the heart. The shell is from 1 mm to 60 cm long and weighs from fractions of a milligram to several kilograms.

Prosobranchs are found predominantly in seas and oceans, at even the most extreme depths. The majority are benthic; a few are planktonic or parasitic. Some species live in freshwaters, and others on land. There are about 15,000 extant species, assigned to several orders (from two to 24). The order Docoglossa, which is sometimes classified as the subclass Peribranchia, includes about 350 littoral marine species. Forms characterized by a symmetrical mantle cavity and by notches or slits in the shell are sometimes isolated in the subclass Aspidobranchia (about 450 marine species). These groups (together with lower Ctenobranchia) are often united in the order Diotocardia. The subclass Ctenobranchia, which is often considered as the order Monotocardia, is distinguished by the greatest diversity of species. Many prosobranchs are commercially valuable. Some are the intermediate hosts of parasites.

A. N. GOLIKOV and IA. I. STAROBOGATOV

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Observaciones anatomicas sobre Tudorella ferruginea (Lamarck, 1822) (Mollusca, Prosobranchia, Pomatiasidae).
Gonad development and fatty acid composition of Patella depressa Pennant (Gastropoda: Prosobranchia) populations with different patterns of spatial distribution, in exposed and sheltered sites.
1987.--Algunos aspectos de la biologia y ecologia de Cittarium pica(L.) "Quigua" (Prosobranchia, Trochidae), en el Parque Nacional Archipielago de los Roques.
Superfeminization, characterized by massive oocyte stimulation, has been observed in freshwater prosobranchia Marisa cornuarietis in response to BPA (5).
Life History and Secondary Production of Goniobasis proxima (Prosobranchia: Pleuroceridae) from Four Appalachian Headwater Streams in Western North Carolina, Virginia Polytechnic Institute and State University, Blacksburg, VA.
Tarebia granifera (Lamarck, 1822) (Gastropoda: Prosobranchia: Pachychilidae) en el Lago de Catemaco, Veracruz, Mexico.
Muller, 1774) (Gastropoda, Prosobranchia), the 1st intermediate host of Clonorchis sinensis (Cobbold, 1875) (Trematoda, Plathyhelmintes).
Se concluye que existen diferencias, principalmente en la region anterior del tubo digestivo (cavidad bucal, esofago y estomago), con respecto a las descripciones generales realizadas para la subclase Prosobranchia.
Valve snails, as members of the subclass Prosobranchia, are equipped with an operculum, a calcareous disk that seals the shell opening when the snail is withdrawn (Clarke, 1981; Thorp and Covich, 2001).
Bisphenol A induces super-feminization in the ramshorn snail Marisa cornuarietis (Gastropoda: Prosobranchia) at environmentally relevant concentrations.
Amin M, Lepez I, Marin O, Delpin M (1984) Male reproductive System of Chorus giganteus (Lesson, 1829) (Muricidae: Prosobranchia): Anatomical and histological description.