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Pyrgiscus thielei
''Pyrgiscus thielei'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔Bouchet, P. (2011). ''Pyrgiscus thielei'' van Aartsen & Corgan, 1996. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=580980 on 2012-01-12〕
==Description==
The bluish white, translucent shell is very small and has an elongate-conic shape. Its length measures 3 mm. There are at least two whorls in the protoconch. These are well rounded, forming a depressed helicoid spire, the axis of which is almost at right angles to the axis of the succeeding turns. The spire of the protoconch is about one-fourth immersed in the first of the succeeding whorls. The seven whorls of the teleoconch are slightly rounded, and strongly appressed at the summit. They are marked by extremely feeble, almost vertical axial ribs which are so poorly defined that they can scarcely be counted. In addition to the axial sculpture, the entire surface of the each whorl is marked by closely spaced, microscopic, spiral striations. The sutures are well constricted. The periphery of the body whorl is
somewhat angulated. The base of the shell is short, and well rounded. The aperture has an elongate-ovate shape. The posterior angle is obtuse. The outer lip is thin. The inner lip is strongly curved and slightly reflected. The parietal wall is covered by a thin callus. 〔 ( Paul Bartsch (1915), Report on the Turton collection of South African marine mollusks; United States National Museum, bulletin 91; described as ''Turbonilla erna'' ) 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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