Rissoina oryza

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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

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

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 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.

References[]

• 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
• Vine, P. (1986). Red Sea Invertebrates. Immel Publishing, London. 224 pp