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Tritia frigens
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Tritia frigens is a of , a marine in the family , the Nassa mud snails or dog whelks.Marshall, B. (2016). Tritia frigens (Martens, 1878). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=876830 on 2016-05-18


Description
The shell grows to a length of 15 mm, its diameter 6 mm.

(Original description in Latin) The shell is ovate, sculptured with smooth, subvertical ribs that are doubly distant in their interspaces and appear nodulosely-abrupt upwards. It also features impressed lines, which are sparse above and more frequent below. A broader, opaque, whitish infrasutural lira is present.

The shell comprises 5-6 whorls, divided by a subcanaliculate suture. The aperture is ovate and slightly oblique, featuring a simple, unarmed white peristome. The inner margin is expanded into a narrow, subelliptic callus superiorly.


Distribution
This species occurs in European waters and in the Atlantic Ocean off and .

  • Cernohorsky W. O. (1984). Systematics of the family Nassariidae (Mollusca: Gastropoda). Bulletin of the Auckland Institute and Museum 14: 1–356.
  • Adam W. & Knudsen J. 1984. Révision des Nassariidae (Mollusca : Gastropoda Prosobranchia) de l’Afrique occidentale. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique 55(9): 1-95, 5 pl.
  • Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 180–213


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