Gymnobela Vicella
''Gymnobela vicella'' is a species of sea snail, a marine gastropod mollusk in the family (biology), family Raphitomidae. Description The length of the (decollate) shell attains 8.5 mm, its diameter 4.5 mm. (Original description) The small, stout shell is subturrited. The nuclear Whorl (mollusc), whorls are eroded. The Spire (mollusc), spire is longer than the Aperture (mollusc), aperture, with about six whorls in addition to the nucleus. The color of the shell is white with a gray, olivaceous periostracum, the aspect much like a stumpy ''Bela (gastropod), Bela'' Leach, 1847. The suture is distinct, not oppressed. The whorl in front of it is slightly constricted, sloping to a prominent keel at the shoulder. This slope is apparently coincident with the anal fasciole and is sculptured only by curved lines of growth and faint indications of axial ribs, which become more prominent in front of the shoulder. They become stronger on the earlier whorls and number about fiftee ...
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Sea Snail
Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the absence of a visible shell. Definition Determining whether some gastropods should be called sea snails is not always easy. Some species that live in brackish water (such as certain neritids) can be listed as either freshwater snails or marine snails, and some species that live at or just above the high tide level (for example species in the genus '' Truncatella'') are sometimes considered to be sea snails and sometimes listed as land snails. Anatomy Sea snails are a very large group of animals and a very diverse one. Most snails that live in salt water respire using a gill or gills; a few species, though, have a lung, are intertidal, and are active only at low tide when they can move around in the air. These air-breathing species includ ...
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