Alvania verrilli

Alvania verrilli is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.[1]

Alvania verrilli
Shell of Alvania verrilli (holotype)
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Littorinimorpha
Superfamily: Rissooidea
Family: Rissoidae
Genus: Alvania
Species:
A. verrilli
Binomial name
Alvania verrilli
(Friele, 1886)
Synonyms[1]
  • Alvania karlini A. H. Clarke, 1963
  • Onoba verrilli (Friele, 1886) (currently placed in genus Alvania)
  • Rissoa verrilli Friele, 1886

Distribution

This marine species occurs in the lower Estuary of St. Lawrence

Description

The maximum recorded shell length is 2.9 mm.[2]

(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. [3]

Habitat

Minimum recorded depth is 180 m.[2] Maximum recorded depth is 190 m.[2]

References
  1. Alvania verrilli (Friele, 1886). Gofas, S. (2009). Alvania verrilli (Friele, 1886). In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2009) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=141253 on 9 August 2010 .
  2. Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. doi:10.1371/journal.pone.0008776.
  3. Friele H. (1886). Zoology, Mollusca II. Den Norske Nordhavs-expedition, 1876-1878, 3(16): 1-44, pl. 7-12 This article incorporates text from this source, which is in the public domain.
  • 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.


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