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''Tegula ligulata'' is a species of sea snail, a marine gastropod mollusk in the family Tegulidae.〔WoRMS (2012). ''Tegula ligulata'' (Menke, 1850). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575694 on 2012-09-01〕〔Keen M. (1971) Sea shells of tropical West America. Marine mollusks from Baja California to Perú, ed. 2. Stanford University Press. 1064 pp.〕 ;Subspecies: * ''Tegula ligulata ligulata'' (Menke, 1850). It is sometimes considered a synonym of ''Tegula eiseni'' (Jordan, 1936) 〔Audubon - Field Guide to North American Shells〕 * ''Tegula ligulata mariamadre'' Pilsbry & Lowe, 1932 (synonym: ''Tegula (Agathistoma) mariana mariamadre'' Pilsbry, H.A. & H.N. Lowe, 1932) ==Description== The height of the shell attains 22 mm, its diameter also 22 mm. This is an extremely variable form. The shell may be either very much depressed or as high as broad. It may be spirally sculptured with numerous narrow, unequal lirae, or as strongly cingulate as the preceding form. The best development of this variety is shown by the specimens from San Diego. They are elevated, turbinated, strongly granose-lirate. The base of the shell is deeply eroded in front of the aperture. The color is brownish-yellow, with numerous close narrow longitudinal purplish-brown stripes, but the whole surface is so dingy that it appears unicolored. The spiral lirae are subequal, the grains low and elongated in the direction of the lirae. The whorls are rounder than in ''Tegula viridula'' and the aperture decidedly smaller, and lacking green tinge on the columella. It is usually encrusted with bryozoa or Serpula. 〔 (Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) 〕 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「Tegula ligulata」の詳細全文を読む スポンサード リンク
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