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Nanula tasmanica
''Nanula tasmanica'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails〔Marshall, B. (2013). Nanula tasmanica (Petterd, 1879). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=719233 on 2014-02-10〕
==Description==
The height of the shell attains 6 mm, its diameter 5.5 mm. The small, rather thin, perforate shell has a globose-turbinate shape. It is lusterless, whitish, tinged with yellow or greenish, unicolored or marked with a few angular radiating maculations of blackish-brown. The spire is very short. The sutures are impressed. The about 4½ whorls are convex, rounded, all over finely regularly spirally lirulate. The body whorl is rounded at the periphery, or very bluntly subangular. It is convex beneath and impressed around the umbilicus. The aperture is quite oblique, rounded-ovate, angular above, broadly rounded below, with a thin iridescent layer of nacre within. The outer, basal and columellar margins are rather thin, curved, the latter joined to the upper margin by a thin white parietal callous. The narrow umbilicus is not bounded by an angle.〔(Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia )〕
This dull whitish little shell may be known by its finely striate surface, narrow umbilicus, short spire and globose-turbinate form.
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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