|
''Perotrochus quoyanus'' is a species of large sea snail, a marine gastropod mollusk in the family Pleurotomariidae, the slit snails.〔Bouchet, P.; Rosenberg, G. (2012). ''Perotrochus quoyanus'' (P. Fischer & Bernardi, 1856). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=467973 on 2013-02-16〕〔Turgeon, D.D., et al. 1998. Common and scientific names of aquatic invertebrates of the United States and Canada. American Fisheries Society Special Publication 26〕 ;Subspecies: * ''Perotrochus quoyanus insularis'' Okutani & Goto, 1985 (synonym: ''Perotrochus insularis'' Okutani & Goto, 1985 ) * ''Perotrochus quoyanus quoyanus'' (P. Fischer & Bernardi, 1856) (synonyms: ''Pleurotomaria quoyana'' Fischer & Bernardi, 1856; ''Perotrochus gemma'' F. M. Bayer, 1966; ''Perotrochus coltrorum'' Rios, 2003) ==Description== The shell of ''Perotrochus quoyanus quoyanus'' has a trochiform shape. It is obtusely carinated, with the base rounded, flattened and concave but not umbilicated. The spire is turbinate, terminating in an acuminate apex. The nine, granulose whorls are slowly increasing. They are rounded and swollen toward the suture. They are divided into two unequal portions by the slit fasciole. The slit fascicle below the middle is decussated by semicircular and spiral striae. The slit is quite wide, but short. The umbilical depression is excavated, nacreous, iridescent, and surrounded by slight concentric grooves. The semioval aperture is nacreous within. The columellar margin is recurved with a nacreous callosity. The nearly sharp outer lip is not reflexed. The color of the shell is pale rose, with obscure dashes or flammules of reddish-brown. 〔 (G.W. Tryon (1890), Manual of Conchology vol. XII, p. 69 ) 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Perotrochus quoyanus」の詳細全文を読む スポンサード リンク
|