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Nansenia Pelagica
Nansenia may refer to: * ''Nansenia'' (fish) - a genus of bony fish Osteichthyes (), popularly referred to as the bony fish, is a diverse superclass of fish that have skeletons primarily composed of bone tissue. They can be contrasted with the Chondrichthyes, which have skeletons primarily composed of cartilag ... * 853 Nansenia - a minor planet of the Sun system {{Disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nansenia (fish)
''Nansenia'' is a genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ... of pencil smelts. Species There are currently 18 recognized species in this genus: * '' Nansenia ahlstromi'' Kawaguchi & J. L. Butler, 1984 * '' Nansenia antarctica'' Kawaguchi & J. L. Butler, 1984 * '' Nansenia ardesiaca'' D. S. Jordan & W. F. Thompson, 1914 (Robust smallmouth) * '' Nansenia atlantica'' Blache & Rossignol, 1962 * '' Nansenia boreacrassicauda'' J. Y. Poulsen, 2015 (Northern fat-tail pencil smelt) Poulsen, J.Y. (2015): A new species of pencil smelt ''Nansenia boreacrassicauda'' (Microstomatidae, Argentiniformes) from the North Atlantic Ocean. ''Zootaxa, 4020 (3): 517-532.'' * '' Nansenia candida'' Cohen, 1958 (Blue-throat argentine) * '' Nansenia crassa'' Lavenberg, 1965 (Stout ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bony Fish
Osteichthyes (), popularly referred to as the bony fish, is a diverse superclass of fish that have skeletons primarily composed of bone tissue. They can be contrasted with the Chondrichthyes, which have skeletons primarily composed of cartilage. The vast majority of fish are members of Osteichthyes, which is an extremely diverse and abundant group consisting of 45 orders, and over 435 families and 28,000 species. It is the largest class of vertebrates in existence today. The group Osteichthyes is divided into the ray-finned fish ( Actinopterygii) and lobe-finned fish (Sarcopterygii). The oldest known fossils of bony fish are about 425 million years old, which are also transitional fossils, showing a tooth pattern that is in between the tooth rows of sharks and bony fishes. Osteichthyes can be compared to Euteleostomi. In paleontology the terms are synonymous. In ichthyology the difference is that Euteleostomi presents a cladistic view which includes the terrestrial tet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
