| Thelyssina | |
|---|---|
Scientific classification  | |
| 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, literally "little cow", is a species of porpoise endemic to the northern end of the Gulf of California. Averaging 150 cm (4.9 ft) (females) or 140 cm (4.6 ft) (males) in length, it is the smallest of all living cetaceans. Today, the species is on the brink of extinction. The steep decline in abundance is primarily due to bycatch in gillnets from the illegal totoaba fishery.
Charopidae is a taxonomic family of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Punctoidea.
Trochaclididae, common name the false top snails, is a family of sea snails, marine gastropod mollusks in the clade Vetigastropoda.
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, 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, marine gastropod mollusks 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 mollusks in the family Seguenziidae.
Seguenzia is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae.
Quinnia is a genus of minute sea snails, marine gastropod mollusks or micromollusks in 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.
Thelyssina sterrha is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.
Halystina umberlee is a species of very small deep-water sea snail, a marine gastropod mollusc in the family Seguenziidae.