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Tropaeas Subglabra
''Tropaeas'' is a genus of sea snails, marine gastropod mollusks in the family Pyramidellidae, the pyrams and their allies.Bouchet, P. (2010). ''Tropaeas'' Dall & Bartsch, 1904. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=545285 on 2011-10-26 General description The surface of the shell is marked by strong axial ribs. The intercostal spaces are spirally pitted. The early teleoconch whorls are sculptured differently from the later ones. The shell is umbilicated and contains two columellar folds. Species * ''Tropaeas badia'' (A. Adams, 1863) * ''Tropaeas brunneomaculata'' (Melvill, 1897) * ''Tropaeas castanea'' (A. Adams, 1863) * ''Tropaeas crassicostata'' (Sowerby III, 1901) * ''Tropaeas enelata'' (Melvill, 1910) * ''Tropaeas gracilis'' (A. Adams, 1854) * ''Tropaeas gradatula'' (Melvill, J.C. & R. Standen, 1897) * ''Tropaeas halaibensis'' Sturany, 1903 * ''Tropaeas imperforata'' Laseron, 1959 * ''Tropaeas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 general, is malacology. Shell morphology terms vary by species group. Shell layers The gastropod shell has three major layers secreted by the Mantle (mollusc), mantle. The calcareous central layer, tracum, is typically made of calcium carbonate precipitated into an organic matrix known as c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
