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Euchemotrema Fraternum Montanum
''Euchemotrema'' is a genus of small, air-breathing land snails, terrestrial animal, terrestrial pulmonate gastropod molluscs in the family Polygyridae. Shell description The shell of species in this genus is usually about 8 to 11 mm in diameter (about 3/8 inch). The shells are brown with a velvety surface, similar to that of ''Stenotrema'', and, in fact, this genus is sometimes combined into ''Stenotrema''.Pilsbry, Henry A. 1940. Land Mollusca of North America (North of Mexico)'. Acad. Nat. Sci. Philadelphia, Monograph 3, vol. 1(2): 675-688. These snails typically have a less complex aperture than ''Stenotrema'': "without a tooth within the outer arc of the lip and with no notch in the basal lip". There are also peculiarities of the male anatomy that separate the two genera. Distribution ''Euchemotrema'' is widely distributed in eastern and central North America. Species This genus includes the following species and subspecies: *''Euchemotrema cheatumi'' (R. W. Fulling ... [...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] |
