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Lirularia yamadana
''Lirularia yamadana'' is a species of small sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.〔Bouchet, P. (2014). Lirularia yamadana (E. A. Smith, 1875). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=732093 on 2014-07-12〕
==Description==
The height of the shell attains 6 mm, its diameter 4½ mm. The ovate-conical, slightly perforate shell is dull whitish. It is painted on the lirae with lilac-brown tessellations, somewhat formed into flammules. The five whorls are convex, and separated by profound sutures, ridged by delicate spiral lirae articulated with lilac-brown (5 to 6 on penultimate, about 20 on the body whorl). The shell shows oblique incremental lines. The pearly aperture is circular, equalling ½ the total length. The columella is a trifle thickened. The terminations of the peristome are joined by a thin callus.
The elongate brownish-lilac spots on the lirations are situated somewhat irregularly underneath each other, so as to form flammulations.〔(H. Pilsbry (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) (described as ''Gibbula yamadana'')〕
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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