Umbonium sagittatum

Umbonium sagittatum
Drawing of a shell of Umbonium sagittatum
Scientific classification
Kingdom:Animalia
Phylum:Mollusca
Class:Gastropoda
Clade:Vetigastropoda
Superfamily:Trochoidea
Family:Trochidae
Genus:Umbonium
Species: U. sagittatum
Binomial name
Umbonium sagittatum
(Hinds, 1845)
Synonyms
  • Globulus articulatus Philippi
  • Globulus sagittatus Philippi
  • Rotella sagittata Hinds, 1845 (original description)

Umbonium sagittatum is a species of very small sea snail, a marine gastropod mollusc or micromollusc in the family Trochidae, the top snails.[1]

Description

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 4ΒΌ 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]

Distribution

This marine species occurs in the Makassar Strait.

References

  1. 1 2 H. Pilsbry (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
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