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Raphitoma Papillosa
''Raphitoma papillosa'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae. Description The length of the shell varies between 5 mm and 10 mm. The elongated, fusiform shell has a pointed spire. The shell contains 7 convex whorls, of which two smooth whorls in the protoconch. They show many pronounced axial ribs and smaller decurrent, lamellar threads forming a reticulation with nodules. The suture is impressed. The body whorl measures more than half the length of the shell. The aperture is suboval. The columella is straight. The siphonal canal is wide and open. The outer lip is rounded and somewhat thickened and denticled inside. The sutural sinus is narrow and well-marked. The ground color of the shell is yellow on which the reticulation comes off in white. Distribution Considered as endemic to the Gulf of Gabès, Tunisia, sporadic records from Lampedusa Island and Sardinia seem to witness a range wider than supposed. Conversely the reco ... [...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] |
