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Raja Straeleni
''Raja straeleni'', the biscuit skate, false thornback skate, or spotted skate, is a species of marine fish in the skate (fish), skate family (biology), family (family Rajidae) of order (biology), order Rajiformes. It is native to the eastern Atlantic Ocean. Description This skate has a blunt, angular snout, a long, thick tail, and a broad flattened angular disc with wing-like pectoral fins.Branch, G.M., Branch, M.L, Griffiths, C.L. and Beckley, L.E. (2010). ''Two Oceans: a guide to the marine life of southern Africa'' Struik Nature, Cape Town. They reach a disc width of up to and are a light brown in colour with black spots, whorls and rosettes. The pectoral fins also have a dark brown eye spot near the base, although these are absent in juveniles. The upper side of the body is covered in many thorn-like spines, with a row of strong thorns along the back and down the tail. Larger individuals may also have thorns on the white underside. Distribution and habitat This species is ... [...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] |
