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Tosatrochus attenuatus
''Tosatrochus attenuatus'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.〔Bouchet, P. (2012). ''Tosatrochus attenuatus'' (Jonas, 1844). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=547324 on 2012-11-23〕〔Poppe G.T., Tagaro S.P. & Dekker H. (2006) The Seguenziidae, Chilodontidae, Trochidae, Calliostomatidae and Solariellidae of the Philippine Islands. Visaya Supplement 2: 1-228.〕
==Description==
The length of the shell varies between 20 mm and 25 mm. The thick, imperforate or very narrowly perforate shell has a conic-elongated shape. It is whitish, ornamented with radiating livid-brown flammules, brown punctulate. The 9 whorls are convex, spirally lirate (the lirae unequal) and longitudinally nodose-costate, the nodules more prominent below. The sutures are impressed. The angulated body whorl is depressed beneath the sutures and nodulous at the periphery. It is very convex and with about 8 concentric lirae beneath, the interstices with intercalated lirulae. The aperture is subquadrate and canaliculate within. The basal margin is arcuate and plicate. The columella is subangular, concave, strongly truncate at base, with a short callus over the umbilicus. 〔 (Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) (described as ''Cantharidus elongatus'') 〕
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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