| Cirsonella extrema | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Clade: | Vetigastropoda |
| Order: | Trochida |
| Superfamily: | Trochoidea |
| Family: | Skeneidae |
| Genus: | Cirsonella |
| Species: | C. extrema |
| Binomial name | |
| Cirsonella extrema Thiele, 1912 | |
Cirsonella extrema is a species of sea snail, a marine gastropod mollusk in the family Skeneidae. [1]
The height of the yellowish white shell attains 2.7 mm, its diameter 2.9 mm. The spire contains 3½ whorls. The round aperture is somewhat oblique. The peristome has a thickened callus, expanded on the left side. Its top is attached to the penultimate whorl. it covers mostly the umbilicus. The brownish operculum is rather thick and consists of polygyrous spirals. [2]
This marine species occurs in Antarctic waters off the South Shetland Islands at depths between 311 m and 426 m.
Acteonidae, common name the "barrel bubble snails", is a family of small sea snails, marine gastropod mollusks of the informal group Lower Heterobranchia.
Marginellona gigas is a species of very large deepwater sea snail, a marine gastropod mollusk in the family Marginellidae. This species was originally thought to be a volute, in the family Volutidae, but it is in fact a giant marginellid.
Cirsonella densilirata is a minute sea snail, a marine gastropod mollusc in the family Skeneidae.
Cirsonella is a genus of small sea snails, marine gastropod molluscs in the family Skeneidae.
Acteon is a genus of small sea snails, predatory marine gastropod mollusks in the family Acteonidae, the barrel bubble snails.
Cirsonella ateles is a species of sea snail, a marine gastropod mollusk in the family Skeneidae.
Cirsonella gaudryi is a species of sea snail, a marine gastropod mollusk in the family Skeneidae.
Cirsonella romettensis is a species of sea snail, a marine gastropod mollusk in the family Skeneidae.
Lissotesta strebeli is a species of sea snail, a marine gastropod mollusk, unassigned in the superfamily Seguenzioidea.
Crossea is a genus of very small sea snails or micromolluscs, marine gastropod molluscs in the family Conradiidae.
Cirsonella kerguelenensis is a species of sea snail, a marine gastropod mollusk in the family Skeneidae.
Cirsonella weldii, common name the shiny liotia, is a species of sea snail, a marine gastropod mollusk in the family Skeneidae.
Cantharidus polychroma is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Chlorodiloma crinita is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Lissotesta unifilosa is a species of sea snail, a marine gastropod mollusk, unassigned in the superfamily Seguenzioidea.
Munditia meridionalis is a species of small sea snail, a marine gastropod mollusk, in the family Liotiidae.
Cirsonella carinata, common name the ridged false-top-shell, is a species of minute sea snail, a marine gastropod mollusk in the family Skeneidae.
Cirsonella cubitalis is a minute sea snail, a marine gastropod mollusc in the family Skeneidae.
Cirsonella microscopia is a species of extremely small sea snail, a marine gastropod mollusk or micromollusk in the family Skeneidae.
Cirsonella naticoides is a species of very small sea snail, a marine gastropod mollusk or micromollusk in the family Skeneidae.