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Umbonium
''Umbonium'', sometimes known as the "button top shells", is a genus of sea snails, marine gastropod molluscs in the family Trochidae, the top snails.Bouchet, P. (2012). Umbonium Link, 1807. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=205005 on 2012-12-04 Shell description The shells of the species in this genus are low-spired and shaped like a button. The orbicular shell is depressed and imperforated. It is polished, porcellaneous and has a very thin pearly layer inside. The whorls are flattened above, bright, smooth or spirally grooved. The small, transverse aperture is wider than high. The thin outer lip is acute. The inner lip is rounded, ending in a simple point. The umbilicus of the shell is often completely covered with a thick and smooth callus. Anatomy The animal has a distinct lateral fringe of the foot, with three filaments on each side. The front of the right side near the base of the tentacles is pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Umbonium Giganteum
''Umbonium giganteum'' is a species of sea snail, a marine gastropod mollusk in the family (biology), family Trochidae, the top snails. Description The height of the shell attains 16 mm, its diameter 27 mm. The large, solid shell has a depressed shape. It is slate-colored or reddish above, with a series of black spots below the suture, sometimes alternating with white ones. The periphery is usually encircled with a row of white blotches. The base is largely white, with a dark streak encircling the callus. The low Spire (mollusc), spire is conoidal and contains seven plane Whorl (mollusc), whorls. The body whorl is often somewhat concave above, rounded at the circumference, and slightly convex beneath. The shining surface is smooth, with a few (usually 4) narrow spiral impressed lines just above the periphery, which are obsolete in the adult. The convex base has a white callus or partly brown or ashen. In the middle there is a prominent, blunt, heavy tubercle. The obliq ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
