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They belong to the phylum Mollusca, which are more commonly called 'mollusks'. Many bivalves feed by filter feeding, in which they draw water over their gills, and tiny organisms collect in the organism's gill mucus. The mantle of mollusks and brachiopods secretes the shell in species that possess shells. The blue mussel is a bivalve - it has two equally-sized, hinged shells that fit together and enclose the animal's soft body. Discover surprising insights and little-known facts about politics, literature, science, and the marvels of the natural world. The image shows the shell and internal body of a bivalve mussel. hemocoel. bivalve meaning: 1. a type of mollusc, such as an oyster, that has its body inside two connected shells: 2. having…. The expansive ctenidia, in addition to functioning in gas exchange, are the main feeding organs. A mollusk having a shell consisting of two lateral plates or valves joined together by an elastic ligament at the hinge, which is usually strengthened by prominences called teeth.The shell is closed by the contraction of two transverse muscles attached to the inner surface, as in the clam, -- or by one, as in the oyster. Byssal, or byssus, threads are strong, silky fibers that are made from proteins that are used by mussels and other bivalves to attach to rocks, pilings or other substrates. They also don't have a radula or jaws. Learner's definition of BIVALVE [count] biology: a sea animal that has a shell with two movable parts connected by a hinge. Clam Dissection Introduction The phylum Mollusca includes snails, clams, chitons, slugs, limpets, octopi, and squid. Mollusks also have a radula or file-like organ for feeding, a mantle that may … Continue reading "Clam Dissection" The taxonomic term Bivalvia was first used by Linnaeus in the 10th edition of his Systema Naturae in 1758 to refer to animals having shells composed of two valves. the blood-filled space or body cavity of some invertebrates. Definition of bivalve in the Definitions.net dictionary. Development. mantle cavity. Bivalve Bi"valve ( ), n. [F. bivalve; bi-(L. bis) + valve valve.] All bivalves are mollusks. Examples of bivalves are clams, mussels, oysters, and scallops. Bivalves are found in both freshwater and marine environments.Â. The name bivalve comes from Latin as most biological classifications do. bivalve n noun: Refers to person, place, thing, quality, etc. noun mycology A bump or protrusion on the top of the cap. PLAY. Shipworms are a bivalve that doesn't have a very visible shell - their shell is made up of two valves at the worm's anterior (back) end. More recently, the class was known as Pelecypoda, meaning "axe-foot" (based on the shape of the foot of the animal when extended). It also forms a mantle Usually water enters the mantle cavity through the inhalant siphon, moves over the gills, and leaves through the exhalant siphon. adj. chromatophore. 2. Having a shell consisting of two hinged valves. Basic bivalve biology: taxonomy, anatomy and life history 2.1 TAXONOMY AND ANATOMY 2.1.1 Introduction. 1. noun zoology One of the lateral prominence just above the hinge of a bivalve shell. 1. bivalve, aquatic mollusk of the class Pelecypoda ("hatchet-foot") or Bivalvia, with a laterally compressed body and a shell consisting of two valves, or movable pieces, hinged by 1 people chose this as the best definition of valve: The definition of a valve... See the dictionary meaning, pronunciation, and sentence examples. Pelecypoda, Lamellibranchia • Bivalves Pour les articles homonymes, voir Acephala . valve (bī′vălv′) n. 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