Umbonella sismondae

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Umbonella sismondae
Original drawing with two views of a shell of Umbonella sismondae
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Vetigastropoda
Order:	Trochida
Superfamily:	Trochoidea
Family:	Trochidae
Genus:	Umbonella
Species:	U. sismondae
Binomial name
Umbonella sismondae (Issel, 1869)
Synonyms
Trochus sismondae Issel, 1869

Umbonella sismondae is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.^[1]

Description[]

The height of the shell attains 4 mm, its diameter also 4 mm. The small, imperforate, greenish shell has a conoid shape. It contains minute, transverse striae. The apex is obtuse. The 4½ whorls increase slowly in size. They are slightly convex and have a distinct suture. The body whorl takes up half of the total length. Its base is angulated and shows on its lower parts four concentric ribs. The oblique aperture is subcircular.^[2]

Distribution[]

This species occurs in the Red Sea on coral reefs.

References[]