|
''Lottia scabra'' or the rough limpet is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae. ==Description== ''L. scabra'' grows to a length of about thirty-five millimetres and has conspicuous rugged radial ribs with darker-coloured interspaces and a boldly scalloped margin. The apex is a quarter of the way across the shell and the anterior slope is neither concave nor convex. The shell is a mottled grey and tan colour and the head and the side of foot are white with black spots.〔(Eogastropoda: Rocky Shore Limpets )〕 The shell size is between 19 and 40 mm and the shell is rather depressed. The apex of the shell has a small depression, a very elongated outline and is located at the anterior third of the shell. In some specimens the apex is nearly central, with a rounded shell.〔 The axial sculpture shows very strong, close, rough ribs with smaller intervening riblets in the interstices. The shell of a young snail is extremely inequilateral and develops rapidly the characteristic ribs.〔 The shell has a white color with fine brown lines between the main ribs. These brown lines dot the otherwise uniform white margin. The principal ribs are sometimes rather sharp, palmating the margin. Occasionally they are small and crowded, becoming faint at the margin.〔Tryon G. W. (1891). ''Manual of Conchology, structural and systematic, with illustrations of the species''. 13: (14-15 ). (plate 1 ), figure 7-9. Philadelphia. (as ''Acmaea spectrum'').〕 The interior of the shell is white with darker spots and bars. It shows a white callus, through which the darker spots appear. These take occasionally the form of irregular ghostly bars (which gave rise to its synonymous name ''Acmaea spectrum'' - spectrum = ghost).〔 The very strong ribs at the outside and the curiously marked interior, like the print of a hand, are prominent characteristics of this species.〔 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「Lottia scabra」の詳細全文を読む スポンサード リンク
|