|
Cyclostrema Exiguum
''Cyclostrema exiguum'' is a species of sea snail, a marine gastropod mollusk in the family Liotiidae. Description The diameter of the shell is 2.3 mm. The shell is rather widely umbilicated. It has a subdiscoidal shape with radiating riblets fimbriating four spiral cariniae. Distribution This species occurs in the Indian Ocean off Madagascar, Réunion and in the Gulf of Aden The Gulf of Aden ( ar, خليج عدن, so, Gacanka Cadmeed 𐒅𐒖𐒐𐒕𐒌 𐒋𐒖𐒆𐒗𐒒) is a deepwater gulf of the Indian Ocean between Yemen to the north, the Arabian Sea to the east, Djibouti to the west, and the Guardafui Channe .... References * Dautzenberg, Ph. (1929). ''Contribution à l'étude de la faune de Madagascar: Mollusca marina testacea. Faune des colonies françaises, III (fasc. 4).'' Société d'Editions géographiques, maritimes et coloniales: Paris. 321–636, plates IV-VII pp. External links * exiguum Gastropods described in 1849 {{Liotiidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
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. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
