| Umbonium sagittatum | |
|---|---|
 | |
| Drawing of a shell of Umbonium sagittatum | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Vetigastropoda |
| Order: | Trochida |
| Superfamily: | Trochoidea |
| Family: | Trochidae |
| Genus: | Umbonium |
| Species: | U. sagittatum |
| Binomial name | |
| Umbonium sagittatum (Hinds, 1845) | |
| Synonyms | |
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Umbonium sagittatum is a species of very small sea snail, a marine gastropod mollusc or micromollusc in the family Trochidae, the top snails. [1]
The height of the shell attains 4 mm, its diameter 6 mm. The shell is smaller and more depressed than is the case in Umbonium vestiarium . The color is fawn or flesh-colored, with a row of arrow-shaped dark spots at the periphery, and another row a short distance below the suture. The shell has about 4¼ whorls, which widen rapidly. The body whorl is depressed. The spire is lower than in Umbonium vestiarium. The basal callus is convex, circular, and smaller than in Umbonium vestiarium and it is either white or slate-colored. The surface of the shell is perfectly smooth and polished. [1]
This marine species occurs in the Makassar Strait.
The Trochidae, common name top-snails or top-shells, are a family of various sized sea snails, marine gastropod molluscs in the subclass Vetigastropoda. This family is commonly known as the top-snails because in many species the shell resembles a toy spinning top.
Umbonium, sometimes known as the "button top shells", is a genus of sea snails, marine gastropod molluscs in the family Trochidae, the top snails.
Homalopoma sanguineum is a species of sea snail, a marine gastropod mollusk in the family Colloniidae.
Lunella smaragda, common name the cat's eye snail, is a species of sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails.
Margarites bairdii, common name Baird's margarite, is a species of sea snail, a marine gastropod mollusk in the family Margaritidae.
Callumbonella suturalis is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Umbonium giganteum is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Umbonium moniliferum is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Umbonium vestiarium, common name the button tops, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Semicassis bisulcata, common name: the Japanese bonnet, is a species of large sea snail, a marine gastropod mollusk in the family Cassidae, the helmet snails and bonnet snails.
Diloma radula is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Ethalia guamensis, common name the Guam button top shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Pseudominolia articulata is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Sericominolia vernicosa is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Umbonium costatum is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Umbonium elegans is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Gibbula rifaca is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Umbonium callosum is a species of small sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Umbonium conicum is a species of very small sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Umbonium suturale is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.