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The earlier name "univalve" means one valve (or shell), in contrast to bivalves, such as clams, which have two valves or shells. Diversity.
The great majority of shelled gastropods or snails have a shell in one part, hence the older name "univalve". The gastropod operculum , when present, even when it is composed mostly of calcium carbonate , is not considered to be a valve.
Univalve – Having the shell composed of a single piece, as a snail. [1] Varicose – Swollen or enlarged. [1] Vascular – Containing or made up of blood vessels. [1] Vermiform – Formed like a worm. [1] Ventral – The lower border or side. [1] Ventricose – Swollen or inflated on the ventral side. [1] Vibratile – Moving from side to ...
Edible molluscs are used to prepare many different dishes, such as Oysters Rockefeller (pictured). This is a partial list of edible molluscs.Molluscs are a large phylum of invertebrate animals, many of which have shells.
Melo amphora moving across coral at low tide. In some (but not all) sea snails, marine gastropod molluscs, the animal has an anterior extension of the mantle called a siphon, or inhalant siphon, through which water is drawn into the mantle cavity and over the gill for respiration.
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The umbo (plural umbones or umbos) is the vaguely defined, often most prominent, highest part of each valve of the shell of a bivalve or univalve mollusc. It usually contains the valve's beak, the oldest point of the valve, and its degree of prominence and position relative to the hinge line are sometimes helpful in distinguishing bivalve taxa. [1]