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Epitonium
''Epitonium'' is a genus of small predatory sea snails, marine gastropod mollusks. ''Epitonium'' is the type genus of the family Epitoniidae, the wentletraps.〔Bouchet, P.; Gofas, S. (2010). Epitonium Röding, 1798. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=137943 on 2010-11-22〕
The common name wentletraps is derived from the Dutch word ''wenteltrap'', denoting a spiral staircase. This refers to the striking form and sculpture of the shells of the mollusks in this genus, and to a lesser extent, the whole family.
The genus ''Epitonium'' has been divided in the past by some authors into several subgenera, but these subgenera were based only on shell characters and did not reflect the true underlying relationships or phylogeny.
==Shell description==
''Epitonium'' shells are high-spired, and are all-white in most of the species within this genus. A few species are tinted with brown to varying degrees, or have a brown stripe on the shoulder of the whorl. The shells typically have blade-like vertical ribs, known as costae.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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