Alvania marchadi is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae. It is named after Igor Marche-Marchad.
Description The length of the shell ranges between 2.25 mm and 2.95 mm and is thickened with a strong rim. The exterior of the shell contains rigid spirals, while the interior is smooth.
The protoconch has 1–3.1.5 convex whorls and "7 spiral flat cords...formed by minute granules".
The teleoconch has 3.3-4.2 convex wholes with "strong, widely spaced, nearly vertical axial folds." The body whorl is rounded with eight spiral and axial folds that fade "towards the periumbilical area". Distribution This marine species occurs in the Atlantic Ocean between the coast off Dakar, Senegal and the Sahara, at depths between 80 m and 250 m.
References
External links Gofas S. (1999). The West African Rissoidae (Gastropoda: Rissooidea) and their similarities to some European species. The Nautilus 113(3): 78-101 Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca. in: Costello, M.J. et al. (eds), European Register of Marine Species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Patrimoines Naturels. 50: 180-213