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Bankivia fasciata
''Bankivia fasciata'', common name the banded kelp shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.〔Bouchet, P. (2012). ''Bankivia fasciata'' (Menke, 1830). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=564813 on 2012-11-23〕〔Beu A.G. (2004) Marine Mollusca of oxygen isotope stages of the last 2 million years in New Zealand. Part 1: Revised generic positions and recognition of warm-water and cool-water migrants. Journal of the Royal Society of New Zealand 34(2): 111-265.〕
==Description==
The length of the shell varies between 15 mm and 25 mm. The thin, imperforate, elongated shell has a turrited shape. This is a variable species in size and coloration. It is polished and shining, white, creamy or pink, with spiral bands of pink, purplish-red or purplish-brown, or narrow oblique zigzag stripes of pinkish-brown, usually with a narrow subsutural fascia of dark or pinkish. The spire is elevated and slender. The dark apex is a little blun. The about 9 whorls are, very slightly convex, and a trifle impressed below the sutures. The surface (under a lens) is very densely, finely spirally striate. The body whorl is rounded. The base of the shell shows a few concentric, separated, impressed lines. The aperture is ovate. The thin outer lipis acute. The sinuous columella is arcuate above and narrowly reflexed, obliquely truncate below. 〔 (H. Pilsbry, Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) (described as ''Cantharidus fasciatus'')〕
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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