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Isanda coronata
''Isanda coronata'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.〔Rosenberg, G. (2012). ''Isanda coronata'' A. Adams, 1854. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=593747 on 2012-11-23〕〔Robertson, R. 1985. Archaeogastropod biology and the systematics of the genus Tricolia (Trochacea: Tricoliidae) in the Indo-West Pacific. Monographs of Marine Mollusca 3: 1-103.〕
==Description==
The size of the shell varies between 4 mm and 10 mm. The small, solid, umbilicated shell has a depressed-turbinate shape.It is polished, pinkish-white, with oblique, undulating grayish-pink longitudinal stripes. The low spire is conic. The apex is acute. The sutures are deeply channelled, bordered by a corona of tubercles or beads . The shell contains 5 whorls. The large body whorl is rounded or subangular at the circumference and convex beneath. The aperture is higher than wide, slightly oblique and quadrangular. The umbilicus is very deep, rather cylindrical, bordered by a deeply crenated white marginal rib, with a narrower beaded cingulus just outside of it.
This is a compact, depressed little shell, with diamond-shaped aperture, showing in fresh specimens a slight trace of pearl within. Adams describes the color as spotted with brown in transverse series, with transverse whitish lines, and a wide subsutural white band. The coloration is very inconstant. The columella is straight, a trifle expanded above,
connected with the upper lip by a thin parietal callus.〔(H. Pilsbry, 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）』
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