| Umboniinae | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Vetigastropoda |
| Order: | Trochida |
| Superfamily: | Trochoidea |
| Family: | Trochidae |
| Subfamily: | Umboniinae H. Adams & A. Adams, 1854 (1840) |
| Synonyms | |
| |
The Umboniinae are a taxonomic subfamily of very small to large sea snails, marine gastropod molluscs in the family Trochidae, common name top snails.
(Original description) The rostrum is rudimentary, while the frontal lobes are greatly developed. The operculum is horny and thin, composed of many gradually enlarging whorls, and is finely ciliated along its outer edge. The shell is orbicular, depressed, polished, and porcellanous, with the umbilical region often covered by a callous deposit.
The Umboniinae H. Adams & A. Adams, 1854 (1840) comprise a well-defined subfamily within the Trochidae Rafinesque, 1815, characterised primarily by their unusual radula with reduced teeth in the central field. Additional distinctive morphological features are also commonly present, such as long up-curving eyestalks with large eyes, a subterminally papillate snout and a medially bifid propodium with pinched-in, trigonal antero-lateral lobes.
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