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Ilyanassa obsoleta : ウィキペディア英語版 | Ilyanassa obsoleta
The eastern mudsnail, ''Ilyanassa obsoleta'', is a species of sea snail, a marine gastropod mollusk in the family Nassariidae, the nassa mud snails. 〔 Rosenberg, G. (2012). Ilyanassa obsoleta (Say, 1822). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=467490 on 2012-10-28 〕 ==Shell description== This species has a small shell which has a slightly rough exterior because the surface has intersecting weak spiral and axial ribs. The shell has an oval aperture with a small notch or siphonal canal at the anterior end. The aperture has a smooth inner lip with a partial shield, and the outer lip is thin and smooth. The exterior of the shell is a chalky white, but it is covered by a very dark brown, closely adhering periostracum, except in areas of the shell where the periostracum has been eroded. The apex of the shell is almost always eroded, and the shell is often quite damaged by the acidic properties of the mud in which the animal lives. The maximum shell length is a little more than one inch, or about 28 mm.
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