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The earlier name "univalve" means one valve (or shell), in contrast to bivalves, ... The estimate of 85,000 mollusks includes 24,000 described species of terrestrial ...
Molluscs are a large phylum of invertebrate animals, many of which have shells. Edible molluscs are harvested from saltwater, freshwater, and the land, and include numerous members of the classes Gastropoda (snails), Bivalvia (clams, scallops, oysters etc.), Cephalopoda (octopus and squid), and Polyplacophora (chitons).
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]
Five views of a shell of Pomacea paludosa. This species is the largest freshwater gastropod native to North America. [3] The shell is globose in shape. The whorls are wide, the spire is depressed, and the aperture is narrowly oval. [3] The shells are brown in color, and have a pattern of stripes. The shell is 60 millimetres (2.4 in) in both ...
Loose shell plates or valves of Chiton tuberculatus from the beach drift. A valve is each articulating part of the shell of a mollusc or another multi-shelled animal such as brachiopods and some crustaceans. Each part is known as a valve or in the case of chitons, a "plate".
Pectinate – Like the teeth of a comb, as the gills of some mollusks. [1] Pedal – Pertaining to the foot. [1] Pedunculated – Supported on a stem or stalk, as the eyes of land snails. [1] Pellucid – Transparent or clear, as the shells of some snails; e. g. Vitrea. [1] Penultimate – The whorl before the last in gastropod shells. [1]
The existence of this pocket shows even in an empty shell, as a visible indentation in the pallial line, a line which runs along parallel to the ventral margin of the shell. [10] The bivalve's two siphons are situated at the posterior edge of the mantle cavity. [11] There is an inhalant or incurrent siphon, and an exhalant or excurrent siphon. [12]
Hanley, S. (1860a), Descriptions of New Univalve Shells from the Collections of H. Cuming and Sylvanus Hanley. Proceedings of the Zoological Society of London, 1859 27: 429-431; Bayer, Ch. (1937) Catalogue of the Doliidae in the Rijksmuseum van Natuurlijke Historie. Overgedrukt uit Zoologiscshe Mededelingen XX, Leiden, E. J. Brill, page(s): 38