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Semelidae
The Semelidae are a family (biology), family of saltwater clams, Marine (ocean), marine bivalve molluscs in the order Cardiida. Description Members of this family have rounded or oval, elongated shells, much flattened. The two valves are connected by an internal ligament in contrast to the closely related family Tellinidae where the ligament is external. The two separate siphons are very long, sometimes several times the length of the shell. These siphons have a characteristic cruciform muscle at their base. Selected genera Genera of Semelidae (with some notable species also listed) include: *''Abra (bivalve), Abra'' Lamarck, 1818 **''Abra aequalis'' (Thomas Say, Say, 1822) **''Abra alba'' (Wood W., 1802) **''Abra californica'' Kundsen, 1970 **''Abra lioica'' (W. H. Dall, Dall, 1881) **''Abra longicallis'' Sacchi, 1836 **''Abra nitida'' (O. F. Mueller, 1776) **''Abra pacifica'' W. H. Dall, Dall, 1915 **''Abra prismatica'' **''Abra profundorum'' E. A. Smith, 1885 **''Abra tenui ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scrobicularia Plana
''Scrobicularia plana'', the peppery furrow shell, is a bivalve mollusc belonging to the family Semelidae. Taxonomy Although ''Scrobicularia plana'' is the only species currently recognized by ITIS in the genus ''Scrobicularia''; World Register of Marine Species recognises another species, ''Scrobicularia cottardi'' as well as some Nomen dubium, nomen dubia, as does the BioLib. The genus ''Scrobicularia'' is sometimes placed as the sole genus in a family, Scrobicularidae. It is now often placed instead in the related family Semelidae, as shown in the infobox. However this placement may change as molecular systematics provides new insights into the cladistics of the bivalves. Description The shell can be anything from white through yellowish to a pale brownish-grey in colour, up to 6.5 cm in diameter. Its interior is nacreous and white or yellowish in colour. The shell is thin but quite deep, with circular closely packed growth ridges. It is a filter feeder, with long sipho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |