Alvania crassistriata

Alvania crassistriata
Shell of Alvania crassistriata (holotype)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Superfamily:	Rissooidea
Family:	Rissoidae
Genus:	Alvania
Species:	†A. crassistriata
Binomial name
†Alvania crassistriata (S. V. Wood, 1848)
Synonyms
† Actonia crassistriata (S. V. Wood, 1848) superseded combination † Rissoa crassistria [sic] † misspelling † Rissoa crassistriata S. V. Wood, 1848 superseded combination (Alvania accepted as full genus)

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

The length of the shell attains 2 mm, its diameter 1.2 mm.

(Original description) The shell is turriculate and elevated, thick and strong. It contains five or six convex whorls. The suture is deep and distinct. The shell is externally ornamented with 10-12 vertical and obtuse ribs and is transversely striated. The striae or ridges are few and elevated, carried over the ribs. The aperture is subcircular, with a thickened and marginate outer lip, denticulated within the aperture.

Fossils were found in the salt mines of Wieliczka, Poland.

• Wood, S. V. (1848). A Monograph of the Crag Mollusca or, descriptions of shells from the middle and upper tertiaries of the east of England. Part 1. Univalves. Monograph of the Palaeontographical Society of London. 1, xii + 1–208, 21: pls This article incorporates text from this source, which is in the public domain.