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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.
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 ...
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.
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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]
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When you buy a bottle of vitamins from a nutrition store, you’ll probably notice a best-by date on the bottom of the jar. But that inscribed number isn’t a hard-and-fast rule—there is some ...
Cornu aspersum (formerly Helix aspersa)—a common land snail. Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks [a] (/ ˈ m ɒ l ə s k s /).