Rissoina oryza

Rissoina oryza is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoinidae.[1]

Rissoina oryza
Original drawing of a shell of Rissoina oryza
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Caenogastropoda
clade Hypsogastropoda
clade Littorinimorpha
Superfamily:
Rissooidea
Family:
Rissoinidae
Genus:
Rissoina
Species:
R. oryza
Binomial name
Rissoina oryza

Description

The height of the small, white shell attains 2 mm. The shell has an oblong-ovate shape. It is solid, smooth, and shining. The spire is moderately elevated, and rather rapidly tapering. The apex is obtuse. The 6-7 whorls are flatly convex. The body whoprl is rather large and slightly compressed beneath. The suture is faintly impressed and broadly margined beneath. The rather large aperture is oblique and has a sub-ovate shape. The thick peristome is dilated. The columella is oblique.[2]

Distribution

This species occurs in the Red Sea and in the South Pacific off the Fiji Islands.

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References
  1. Rissoina oryza . WoRMS (2009). Rissoina oryza. Accessed through the World Register of Marine Species at http://marinespecies.org/aphia.php?p=taxdetails&id=216935 on 9 August 2010 .
  2. Garrett A. (1873). New species of marine shells inhabiting the South Sea Islands. Proceedings of the Academy of Natural Sciences of Philadelphia, 25: 209-231, pl. 2-3


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