Syrnola Arcta
''Syrnola'' is a genus of sea snails, marine (ocean), marine gastropod mollusks in the subfamily Turbonillinae of the family (biology), family Pyramidellidae, the pyrams and their allies.Bouchet, P.; Gofas, S. (2011). ''Syrnola'' A. Adams, 1860. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138419 on 5 February 2012 General description The species in ''Syrnola'' are medium-sized and slender. Their shell is subulate and polished, marked by fine lines of growth and microscopic spiral striations. It doesn't contain an Umbilicus (mollusc), umbilicus. The Whorl (mollusc), whorls of the teleoconch are flattened and increasing regularly in size. The Suture (anatomy), suture is well marked. The Aperture (mollusc), aperture is suboval. The Lip (gastropod), outer lip is simple. They possess only one Columella (gastropod), columellar fold. Species Species within the genus ''Syrnola'' include: * ''Syrnola acerrima'' Watson, 188 ...
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Gastropod Shell
The gastropod shell is part of the body of a Gastropoda, gastropod or snail, a kind of mollusc. The shell is an exoskeleton, which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage. Some gastropods appear shell-less (slugs) but may have a remnant within the mantle, or in some cases the shell is reduced such that the body cannot be retracted within it (semi-slug). Some snails also possess an operculum that seals the opening of the shell, known as the Aperture (mollusc), aperture, which provides further protection. The study of mollusc shells is known as conchology. The biological study of gastropods, and other molluscs in gen