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Evalea amchitkana
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Evalea amchitkana : ウィキペディア英語版
Evalea amchitkana

''Evalea amchitkana'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔Rosenberg, G. (2011). ''Evalea amchitkana'' (Dall & Bartsch, 1909). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581089 on 2011-10-26〕〔Turgeon, D.; Quinn, J.F.; Bogan, A.E.; Coan, E.V.; Hochberg, F.G.; Lyons, W.G.; Mikkelsen, P.M.; Neves, R.J.; Roper, C.F.E.; Rosenberg, G.; Roth, B.; Scheltema, A.; Thompson, F.G.; Vecchione, M.; Williams, J.D. (1998). Common and scientific names of aquatic invertebrates from the United States and Canada: mollusks. 2nd ed. American Fisheries Society Special Publication, 26. American Fisheries Society: Bethesda, MD (USA). ISBN 1-888569-01-8. IX, 526 + cd-rom pp.〕
==Description==
The thin shell has a broadly conic shape. It is semitranslucent, bluish-white. Its length measures 3.3 mm. The whorls of the protoconch are very obliquely immersed in the first of the succeeding turns, above which only the last half of the last turn is visible. The five whorls of the teleoconch are well rounded, and faintly shouldered at the summit. They are marked by fine lines of growth and numerous very fine equal and equally spaced spirally incised lines, of which there are probably more than forty between the periphery and the summit of the last turn. The sutures are rendered subchanneled by the slight shoulder at the summit of the whorls. The periphery and the base of the body whorl are well rounded, the latter somewhat attenuated and marked like the spaces between the sutures. The aperture is large, and broadly pear-shaped. The posterior angle is obtuse. The outer lip is broadly recurved, thin, and showing the fine external striation within. The columella is slender, curved, and revolute. It is reinforced by the attenuated base and provided with a weak fold at its insertion, which is not visible when the aperture is viewed squarely. The parietal wall is glazed with a thin callus. 〔 (Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 210; 1909 (described as ''Odostomia (Evalea) amchitkana'') ) 〕

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