Umbonella sismondae
Umbonella sismondae is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.[1]
| Umbonella sismondae | |
|---|---|
 | |
| Original drawing with two views of a shell of Umbonella sismondae | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Clade: | Vetigastropoda |
| Order: | Trochida |
| Superfamily: | Trochoidea |
| Family: | Trochidae |
| Genus: | Umbonella |
| Species: | U. sismondae |
| Binomial name | |
| Umbonella sismondae (Issel, 1869) | |
| Synonyms | |
|
Trochus sismondae Issel, 1869 | |
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.
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References
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