Umbonella sismondae

Umbonella sismondae
Original drawing with two views of a shell of Umbonella sismondae
Scientific classification
Kingdom:Animalia
Phylum:Mollusca
Class:Gastropoda
Clade:Vetigastropoda
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

  1. ↑ Umbonella sismondae (Issel, 1869).  Retrieved through: World Register of Marine Species on 1 May 2010.
  2. ↑ Issel A. (1869), Malacologia del Mar Rosso : ricerche zoologiche e paleontologiche / di Arturo Issel ; memoria letta al congresso dei Naturalisti Italiani in Vicenza nel 1868
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