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Pleurotomella Evadne
''Pleurotomella evadne'' is a species of sea snail, a marine gastropod mollusk in the family (biology), family Raphitomidae. Description The length of the shell attains 4 mm, its diameter 1.55 mm. The white, rather stout shell is small, reduced in length and rounded out. It contains six Whorl (mollusc), whorls. The protoconch is smooth and globose. The subsequent whorls are impressed at the suture. They are swollen and show oblique, wide ribs with about 18 on the body whorl. There are only a few spiral lirae. These are undeveloped. The quadrate interstices are depressed. The outer Lip (gastropod), lip is thin, simple. The Aperture (mollusc), aperture is oblong and white on its interior. The siphonal canal is short. Distribution This species occurs in the Persian Gulf and in the Gulf of Oman. References External links * {{DEFAULTSORT:Pleurotomella Evadne Pleurotomella, evadne Gastropods described in 1912 ... [...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] |
