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Bivalvia (/ b aɪ ˈ v æ l v i ə /) or bivalves, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of aquatic molluscs (marine and freshwater) that have laterally compressed soft bodies enclosed by a calcified exoskeleton consisting of a hinged pair of half-shells known as valves.
Freshwater bivalves are molluscs of the order Bivalvia that inhabit freshwater ecosystems. They are one of the two main groups of freshwater molluscs , along with freshwater snails . The majority of bivalve molluscs are saltwater species that live in the marine habitats , but a number of families have evolved to live in fresh water (and in some ...
The two major classes of molluscs have representatives in freshwater: the gastropods (snails) and the bivalves (freshwater mussels and clams.) It appears that the other classes within the Phylum Mollusca -the cephalopods, scaphopods, polyplacophorans, etc. - never made the transition from a fully marine environment to a freshwater environment.
An assortment of shells of marine bivalves and a few marine gastropods found on a beach in Wales In May 2010, a new taxonomy of the Bivalvia was published in the journal Malacologia . The 2010 taxonomy is known as the Taxonomy of the Bivalvia (Bouchet, Rocroi, Bieler, Carter & Coan, 2010) [ citation needed ] .
Murphy, Richard C. 1971. The structure and ultrastructure of the pineal organ of the bluefin tuna, Thunnus thynnus. J. Morph. 133(1):1-16. Murphy, Richard C. 1983. The introduced bivalve, Mercenaria mercenaria in a shallow coastal ecosystem: 1) Factors affecting its distribution, 2) Contribution to benthic community metabolism. Ph.D. Dissertation.
Velesunio wilsonii come from one of two classes of molluscs that have successfully inhabited freshwater ecosystems. [1] All other mollusc classes remain in marine ecosystems. [1] Bivalve molluscs evolved in marine ecosystems before slowly moving into estuaries and inhabiting upstream freshwater habitats, evolving to tolerate lower salinity ...
Unionidae burrow into the substrate, with their posterior margins exposed. They pump water through the incurrent aperture, obtaining oxygen and food. They remove phytoplankton and zooplankton, as well as suspended bacteria, fungal spores, and dissolved organic matter.
The Arcida is an extant order of bivalve molluscs. [1] This order dates back to the lower Ordovician period. They are distinguished from related groups, such as the mussels, by having a straight hinge to the shells, and the adductor muscles being of equal size. [2]