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Turbonilla angea
''Turbonilla angea'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies. 〔
==Description==
The brownish yellow shell has an elongate-conic shape. Its length measures 5 mm. (The whorls of the protoconch are decollated). The 7½ whorls of the teleoconch are very slightly rounded, and feebly shouldered at the summit. They are marked by rather broad, low, somewhat protractive axial ribs, of which 16 occur upon the second, 18 upon the third to fifth; 20 upon the sixth; and 22 upon the penultimate turn. These ribs are about double the width of the spaces that separate them. In addition to the ribs, the whorls are marked by exceedingly fine, microscopic, spiral striations. The periphery of the body whorl is well rounded. The base of the shell is moderately long, and well rounded. It is crossed by the very feeble continuations of the axial ribs and exceedingly fine, spiral striations. The aperture is oval. The posterior angle is acute. The outer lip is thin. The inner lip is very short, slightly revolute and appressed. It is provided with a weak fold at its insertion. The parietal wall is glazed with a thin callus.. 〔 ( Paul Bartsch (1915), Report on the Turton collection of South African marine mollusks; United States National Museum, bulletin 91; p. 77 ) 〕
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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