Cirsonella microscopia

Cirsonella microscopia is a species of extremely small sea snail, a marine gastropod mollusk or micromollusk in the family Skeneidae.^[1]

Cirsonella microscopia
Original image of a shell of Cirsonella microscopia
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Vetigastropoda
Order:	Trochida
Superfamily:	Trochoidea
Family:	Skeneidae
Genus:	Cirsonella
Species:	C. microscopia
Binomial name
Cirsonella microscopia (Gatliff & Gabriel, 1910)
Synonyms
Cyclostrema microscopica Gabriel, C. & Gatliff, J.H. 1910

Description

(Original description by Gatliff & Gabriel:) The diameter of this very minute shell is 0.75 mm. The white, semitranslucent, deeply umbilicated shell consists of four rounded whorls that rapidly increase in size. The apex is smooth, and is succeeded by lirate whorls. The lirae number about five on the penultimate whorl, which increase in number by intercalation to about fifteen at the outer edge of the lip. The aperture is circular. The outer lip is simple.^[2]

Distribution

This marine species is endemic to Australia. It occurs off Victoria and the Bass Strait.