| Thelyssina | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Vetigastropoda |
| Family: | Seguenziidae |
| Subfamily: | Asthelysinae |
| Genus: | Thelyssina Marshall, 1983 |
| Type species | |
| Thelyssina sterrha Thelyssina sterrha | |
Thelyssina is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae. [1]
The conical shell contains a peripheral carina but no axial riblets, spiral lirae or microsculpture. The U-shaped posterior sinus is shallow. The anterolateral sinus is a channel. The basal sinus is present. The columella has no sinus or tooth. The aperture has a rhomboidal shape. There are no data about the radula. [2]
Species within the genus Thelyssina include:
The vaquita is a species of porpoise endemic to the northern end of the Gulf of California in Baja California, Mexico. Reaching a maximum body length of 150 cm (4.9 ft) (females) or 140 cm (4.6 ft) (males), it is the smallest of all living cetaceans.
Seguenziidae is a family of very small deepwater sea snails, marine gastropod mollusks in the superfamily Seguenzioidea.
Seguenzioidea is a superfamily of minute to medium-sized sea snails, marine gastropod mollusks in the clade Vetigastropoda.
Gemmula, common name the gem turrids, is a genus of sea snails, marine gastropod mollusks in the family Turridae, the turrids.
Ancistrobasis is a genus of sea snails, and marine gastropod mollusks in the family Seguenziidae.
Asthelys is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae.
Basilissopsis is a genus of sea snails in the family Seguenziidae.
Calliobasis is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae.
Carenzia is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae.
Fluxinella is a genus of sea snails, marine gastropod mollusks in the tribe Fluxinellini ( of the subfamily Seguenziinae in the family Seguenziidae.
Guttula is a genus of sea snails, marine gastropod molluscs in the family Seguenziidae.
Halystina is a genus of sea snails, marine gastropod mollusks in the subfamily Seguenziinae of the family Seguenziidae.
Seguenzia is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae.
Tomopleura is a genus of sea snails, marine gastropod mollusks in the family Borsoniidae.
Clavus is a genus of small sea snails, marine gastropod mollusks in the family Drilliidae.
Quinnia is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the subfamily Seguenziinae of the family Seguenziidae.
Borsonia is a genus of sea snails, marine gastropod mollusks in the family Borsoniidae.
Sericogyra is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae.
Awateria is a genus of sea snails, marine gastropod mollusks in the family Borsoniidae. Most species in this genus have become extinct.
Halystina umberlee is a species of very small deep-water sea snail, a marine gastropod mollusc in the family Seguenziidae.