Vanitrochus tragema explained

Vanitrochus tragema is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.^{[1] [2]}

Description

The size of the shell varies between 1.8 mm and 4 mm.

(Original description)This is a small conical chalky-white shell, colourless excepting for scattered transverse pink flames round the upper parts of the lower whorls just below the sutures. The shell is profoundly but narrowly umbilicate. The shell contains six whorls six, two being in the protoconch, slantingly angled in a gradate manner. The surface is closely acutely ribbed, the transverse decussations somewhat noticeable in the interstices, and these in some specimens give a crenulate appearance to the ribs themselves. The base is spirally costulate, as are the upper whorls. The aperture is round. The outer lip is simple.^[3]

Distribution

This marine species occurs off the Loyalty Islands, Tuvalu, and Australia (Queensland)

References

• Hedley, C. 1899. The Mollusca of Funafuti. Part 1. Gastropoda. Memoirs of the Australian Museum 3(7): 395-488
• Iredale, T. 1929. Queensland molluscan notes, No. 1. Memoirs of the Queensland Museum 9(3): 261-297, pls 30-31
• Herbert, D. G. (1989). Pagodatrochus, a new genus for Minolia variabilis H. Adams, 1873 (Gastropoda: Trochidae. Journal of Molluscan Studies. 55: 365-372.
• Wilson, B. 1993. Australian Marine Shells. Prosobranch Gastropods. Kallaroo, Western Australia : Odyssey Publishing Vol. 1 408 p

External links

• Encyclopedia of Life
• World Register of Marine Species

Notes and References

1. Bouchet, P. (2012). Vanitrochus tragema (Melvill & Standen, 1896). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=547295 on 2012-11-23
2. Poppe G.T., Tagaro S.P. & Dekker H. (2006) The Seguenziidae, Chilodontidae, Trochidae, Calliostomatidae and Solariellidae of the Philippine Islands. Visaya Supplement 2: 1-228.
3. https://www.biodiversitylibrary.org/page/31980852 Melvill, J.C. & Standen, R. 1896. Notes on a collection of shells from Lifu and Uvea, Loyalty Islands, formed by the Rev. James and Mrs. Hadfield, with list of species. Part II. Journal of Conchology 8(9): 273-315, pls 9-11