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Wicker Ancylid
The wicker ancylid (''Rhodacmea filosa'') is a species of small, air-breathing, freshwater snail or limpet, a pulmonate gastropod in the family Planorbidae. ''Rhodacmea filosa'' is the type species of the genus ''Rhodacmea''. Distribution This species is endemic to the United States and was thought to be extinct, until its rediscovery in 2011.Ó Foighil D., Li J., Lee T., Johnson P., Evans R. & Burch J. B. (2011). "Conservation Genetics of a Critically Endangered Limpet Genus and Rediscovery of an Extinct Species". '' PLoS ONE'' 6(5): e20496. . It occurred in the Mobile River Basin rivers and their tributaries. The type locality is the Black Warrior River, south of Blount Springs, Alabama. Conrad T. A. (1834). "New fresh-water shells of the United States, with coloured illustrations, and a monograph of the genus ''Anculotus'' of Say; also a synopsis of the American naiads". Judah Dobson, Philadelphia, 76 pppage 57 Over the past 20 years, extensive surveys that included hundr ... [...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] |
