Alvania verrilli is a species of small sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
Distribution This marine species occurs in the lower Estuary of St. Lawrence
Description The maximum recorded shell length is 2.9 mm.Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. .
(Original description) The white, solid shell is ovo-elongate. It contains 5 convex whorls. The protoconch is obtuse and smooth. The suture is deep. The aperture is sub-circular. The sculpture consists of, about 20 strongly prominent axial ribs, and a microscopically minute and close spiral striation. There is no umbilicus but only a minute umbilical split. The outer lip is thickened.
The peculiar fine spiral sculpture causes this species to be readily distinguishable.Friele H. (1886). Zoology, Mollusca II. Den Norske Nordhavs-expedition, 1876-1878, 3(16): 1-44, pl. 7-12
Habitat Minimum recorded depth is 180 m. Maximum recorded depth is 190 m.
References
Clarke, A. H. (1963). Arctic archibenthal and abyssal molluscs. II. Molluscs dredged from drifting station Charlie (Alpha II). National Museum of Canada Bulletin. 185: 90-109 Brunel, P., Bosse, L. & Lamarche, G. (1998). Catalogue of the marine invertebrates of the estuary and Gulf of St. Lawrence. Canadian Special Publication of Fisheries and Aquatic Sciences, 126. 405 pp.
External links 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.