Sphaerium


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Sphaerium

 

(also Sphaeriidae), a genus of bivalve mollusks. (Some classifications treat the mollusks as a group of genera, a subfamily, or a family.) The oval or spherical shell is 1–3 cm long; there is a beak in the center of the mantle. The mollusks are viviparous, with the newly born young acting the same as adults.

The Sphaerium are distributed mainly in northern temperate regions. There are some species in the tropics (East Africa), and some in southern temperate regions (South America and Australia). The mollusks inhabit freshwaters, burrowing to a shallow depth in the silty or sandy bottom.

References in periodicals archive ?
In laboratory, animals were determined to species level, except Oligochaeta, Ostracoda, Pisidium and Sphaerium clams, leeches, insect larvae, and juvenile gammarids.
Based on nephridia characteristics, Korniushin (1998) suggested that all African Sphaerium spp.
Amphipoda) y Physa venustula (Gastropoda); Sphaerium sp.
Gastropoda, Sphaerium, and the adult Hydracarina as heavier animals were considered as macrozoobenthos regardless of their size.
1994), freshly metamorphosed Unto (Herbers, 1913) and juvenile Sphaerium (Wasserloos, 1911, figs.
Sphaerium nitidum Clessin, 1876 Arctic fingernailclam Native
lilljeborgi (Clessin), and Sphaerium nitidum (Clessin)) (Clarke 1973, 1981) were abundant at most depths, especially at [is greater than] 1 m.
Polyploidy and meiosis in the freshwater clam Sphaerium striatinum (Lamarck) and chromosome numbers in the Sphaeriidae (Bivalvia, Veneroida).
in samples) samples) 2002 2003 2002 2003 Einfeldia carbonaria 95 177 Glyptotendipes paripes 297 87 Polypedilum tetracrenatum 54 Stictochironomus rosenschoeldi 49 298 Endochironomus albipennis 121 Lumbriculus variegatus 76 Limnodrilus hoffmeisteri 75 32 Limnodrilus udekemianus 117 Psammoryctides barbatus 33 Sphaerium spp.
Reproduction of fingernail clams (Sphaeridae: Sphaerium and Musculum).