| Halistylus | |
|---|---|
 | |
| Two shells of Halistylus columna | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Vetigastropoda |
| Order: | Trochida |
| Superfamily: | Trochoidea |
| Family: | Trochidae |
| Genus: | Halistylus Dall, 1890 |
| Type species | |
| Cantharidus columna Dall, 1890 | |
Halistylus is a genus of very small sea snails, marine gastropod mollusks in the family Trochidae, the top snails. [1]
The small, polychromatic shell has a cylindrical shape. It is holostomatous, i.e. the aperture is rounded or entire, uninterrupted by the siphonal canal, notch, or by any other extension. The operculum is multispiral and coriaceous. There is no spiral sculpture. Such a cylindrical shape is rather uncommon in the family Trochidae. But the belonging of this genus to this family is certified by the shell structure, the pearly aperture and anatomical features. [2]
This genus was previously considered a subgenus of the genus Cantharidus Montfort
Species within the genus Halistylus include:
Calliostoma is a genus of small to medium-sized sea snails with gills and an operculum, marine gastropod molluscs within the family Calliostomatidae, the Calliostoma top snails. Previously this genus was placed within the family Trochidae. Calliostoma is the type genus of the family Calliostomatidae.
Calliostomatidae is a family of sea snails within the superfamily Trochoidea and the clade Vetigastropoda.
Umbonium, sometimes known as the "button top shells", is a genus of sea snails, marine gastropod molluscs in the family Trochidae, the top snails.
Teinostoma is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Teinostomatidae.
Hipponix, common name hoof snails or hoof shells, is a genus of small sea snails with limpet-like shells, marine gastropod molluscs in the family Hipponicidae, the hoof snails. Many of the species in this genus have white shells.
Plesiocystiscus is a genus of minute predatory sea snails, marine gastropod mollusks or micromollusks in the family Cystiscidae.
Homalopoma, common name the dwarf turbans, is a genus of mostly very small sea snails with a calcareous operculum, marine gastropoda molluscs in the subfamily Colloniinae of the family Colloniidae.
Fossarina is a genus of sea snails, marine gastropod molluscs in the family Trochidae, the top shells.
Cantharidus, common name the kelp shells, is a genus of sea snails, marine gastropod molluscs of the family Trochidae, the top shells.
Amphissa is a genus of small sea snails, marine gastropod mollusks in the family Columbellidae, the dove snails.
Nitidella is a genus of sea snails, marine gastropod mollusks in the family Columbellidae, the dove snails.
Lischkeia is a genus of sea snails, marine gastropod molluscs in the family Eucyclidae.
Leptothyra is a genus of sea snails, marine gastropod mollusks in the family Colloniidae.
Haplocochlias is a genus of sea snails, marine gastropod mollusks in the family Skeneidae.
Vetulonia is a genus of sea snails, marine gastropod mollusks, unassigned in the superfamily Seguenzioidea.
Lacuna is a genus of sea snails, marine gastropod mollusks in the family Littorinidae, the winkles or periwinkles.
Rictaxis is a genus of minute sea snails or "bubble snails", marine gastropod mollusks or micromollusks in the family Acteonidae, the "barrel bubble" snails.
Lirularia is a genus of small sea snails, marine gastropod mollusks in the subfamily Umboniinae of the family Trochidae, the top snails.
Halistylus columna is a species of small sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Halistylus pupoideus is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.