Alvania discors

Alvania discors
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Family:	Rissoidae
Genus:	Alvania
Species:	A. discors
Binomial name
	Alvania discors; (Allan, 1818)
Synonyms
	Alvania boria Risso, 1826; Alvania crassicostata Risso, 1826; Alvania ferruginosa Risso, 1826; Alvania mediterranea Risso, 1826; Alvania montagui (Payraudeau, 1826); Alvania montagui var. asperula Brugnone, 1880; † Alvania montagui var. subampulla Zhizhchenko, 1936 (basionym); Alvania sardea Risso, 1826 (dubious synonym); †Alvania subampulla Zhizhchenko, 1936 (within the variability of R. montagui); Rissoa montacuti Jeffreys, 1884 (unjustified emendation of montagui Payraudeau, 1826); Rissoa montagui Payraudeau, 1826; Rissoa nicolosiana Aradas & Benoit, 1874; Rissoa peloritana Aradas & Benoit, 1874; Turbo discors T. Brown, 1818; Turbo discrepans T. Allan, 1818;

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

Description

The length of the shell varies between 4 mm and 5 mm.

(Original description) The shell is pointed and strong. It contains five longitudinal and transverse striae. Inside it is ribbed. The outer lip is thickened. The body is longer than the spire.^[2]

(Description as Rissoa montagui) The shell is imperforate and, thick. It is spirally lirate, longitudinally strongly ribbed. It is whitish, yellowish or has a chestnut color, plain or with one or two bands. The shell contains five whorls. The suture is distinct and subchanneled. The aperture is white-lipped and sulcate within, with a white varix externally. ^[3]

Distribution

This marine species has a wide distribution. It is found in the following locations:

European waters
Mediterranean Sea (Italy, Greece)
Atlantic Ocean (Canada, USA)
Pacific Ocean

Fossils have been found in Pleistocene strata near Santa Flavia, Sicily and near Monastir, Tunisia; also in Pliocene strata near Siena, Italy.

References

^ ^a ^b Alvania discors (Allan, 1818). Gofas, S. (2009). Alvania discors (Allan, 1818). In: Bouchet, P.; Gofas, S.; Rosenberg, G. World Marine Mollusca database. Accessed through the World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=141181 on 18 April 2012 .
^ Allan T. (1818). Sketch of the geology of the environs of Nice. Transactions of the Royal Society of Edinburgh 8(2): 427-464, pl. 8-10
^ G.W. Tryon (884), Manual of conchology, structural and systematic : with illustrations of the species; Academy of Natural Sciences ser. 1, vol. 9

Zhizhchenko, B. (1936). Чокракские моллюски [= Chokrakian molluscs]. Paleontologija SSSR. 10(3): 1–323, 26 pls.

External links

[WoRMS-1] Alvania discors (Allan, 1818). Gofas, S. (2009). Alvania discors (Allan, 1818). In: Bouchet, P.; Gofas, S.; Rosenberg, G. World Marine Mollusca database. Accessed through the World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=141181 on 18 April 2012 .

[2] Allan T. (1818). Sketch of the geology of the environs of Nice. Transactions of the Royal Society of Edinburgh 8(2): 427-464, pl. 8-10

[3] G.W. Tryon (884), Manual of conchology, structural and systematic : with illustrations of the species; Academy of Natural Sciences ser. 1, vol. 9

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