Cirsonella kerguelenensis | |
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Scientific classification ![]() | |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Clade: | Vetigastropoda |
Superfamily: | Trochoidea |
Family: | Skeneidae |
Genus: | Cirsonella |
Species: | C. kerguelenensis |
Binomial name | |
Cirsonella kerguelenensis Thiele, 1912 | |
Cirsonella kerguelenensis is a species of sea snail, a marine gastropod mollusk in the family Skeneidae. [1]
In biology, a species ( ) is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. While these definitions may seem adequate, when looked at more closely they represent problematic species concepts. For example, the boundaries between closely related species become unclear with hybridisation, in a species complex of hundreds of similar microspecies, and in a ring species. Also, among organisms that reproduce only asexually, the concept of a reproductive species breaks down, and each clone is potentially a microspecies.
Sea snail is a common name for snails that normally live in salt water, in other words marine gastropods. The taxonomic class Gastropoda also includes snails that live in other habitats, such as land snails and freshwater snails. Many species of sea snails are edible and exploited as food sources by humans.
Family is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy; it is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as being the "walnut family".
The height of the shell attains 2.3 mm.
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This species occurs off the Kerguelen Islands, Southern Indian Ocean and off Argentina at a depth of 600 m.
The Kerguelen Islands, also known as the Desolation Islands, are a group of islands in the Antarctic constituting one of the two exposed parts of the Kerguelen Plateau, a large igneous province mostly submerged by the southern Indian Ocean. They are among the most isolated places on Earth, located 450 km (280 mi) northwest of the uninhabited Heard Island and McDonald Islands and more than 3,300 km (2,100 mi) from Madagascar, the nearest populated location. The islands, along with Adélie Land, the Crozet Islands, Amsterdam and Saint Paul Islands, and France's Scattered Islands in the Indian Ocean, are part of the French Southern and Antarctic Lands and are administered as a separate district.
Argentina, officially named the Argentine Republic, is a country located mostly in the southern half of South America. Sharing the bulk of the Southern Cone with Chile to the west, the country is also bordered by Bolivia and Paraguay to the north, Brazil to the northeast, Uruguay and the South Atlantic Ocean to the east, and the Drake Passage to the south. With a mainland area of 2,780,400 km2 (1,073,500 sq mi), Argentina is the eighth-largest country in the world, the fourth largest in the Americas, and the largest Spanish-speaking nation. The sovereign state is subdivided into twenty-three provinces and one autonomous city, Buenos Aires, which is the federal capital of the nation as decided by Congress. The provinces and the capital have their own constitutions, but exist under a federal system. Argentina claims sovereignty over part of Antarctica, the Falkland Islands, and South Georgia and the South Sandwich Islands.
Lissotesta is a genus of minute sea snails or micromolluscs, marine gastropod molluscs, unassigned in the superfamily Seguenzioidea.
Eumetula is a genus of minute sea snails, marine gastropod molluscs in the family Newtoniellidae.
Cirsonella is a genus of small sea snails, marine gastropod molluscs in the family Skeneidae.
Trachysma is a genus of sea snails, marine gastropod mollusks in the family Pendromidae.
Pleurotomella is a genus of sea snails, marine gastropod mollusks in the family Raphitomidae.
Prosipho is a genus of sea snails, marine gastropod mollusks in the family Buccinidae, the true whelks.
Parmaphorella is a genus of sea snails, marine gastropod mollusks in the family Fissurellidae, the keyhole limpets.
Cirsonella extrema 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.
Eatoniella is a genus of minute sea snails, marine gastropod mollusks in the family Eatoniellidae, the eatoniellids.
Suterilla is a genus of minute operculate snails, marine gastropod mollusks or micromollusks in the family Assimineidae.
Rissoa is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae.
The Skeneidae are a family of minute to small marine gastropod molluscs in the superfamily Trochoidea.
Cerithiella is a genus of minute sea snails, marine gastropod molluscs in the family Newtoniellidae.
Crossea is a genus of very small sea snails or micromolluscs, marine gastropod molluscs in the family Conradiidae.
Cirsonella georgiana is a species of sea snail, a marine gastropod mollusk in the family Skeneidae.
Cirsonella globosa is a species of sea snail, a marine gastropod mollusk in the family Skeneidae, the turban snails.
Cirsonella margaritiformis 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.
Lissotesta unifilosa is a species of sea snail, a marine gastropod mollusk, unassigned in the superfamily Seguenzioidea.
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