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Brazilichthys
''Brazilichthys'' is an extinct genus of prehistoric freshwater ray-finned fish that lived during the Cisuralian (early Permian) epoch (geology), epoch in what is now Maranhão, Brazil (Parnaíba Basin). The type species, type and only species, ''B. macrognathus'', is known from a single partially complete skull (ca. long), which was recovered from the Pedra de Fogo Formation near Pastos Bons, Maranhão, Brazil. Classification ''Brazilichthys'' is referred to its own family (biology), family, Brazilichthyidae (monotypy). Its phylogeny, evolutionary relationships to other genera are not well known. It was hypothesized that ''Brazilichthys'' could be closely related to the Triassic ''Birgeria'', though this was subsequently considered unlikely. See also * Prehistoric fish * List of prehistoric bony fish References Prehistoric ray-finned fish genera Permian Brazil Paleozoic fish of South America Fossils of Brazil Kungurian genera Fossil taxa described in 1991 {{palaeoni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Birgeria
''Birgeria'' is a genus of carnivorous marine ray-finned fish from the Triassic period. ''Birgeria'' had a global distribution. Fossils were found in Madagascar, Spitsbergen, Germany, Switzerland, Italy, Slovenia, China, Russia, Canada and Nevada, United States. The oldest fossils are from Griesbachian aged beds of the Wordie Creek Formation of East Greenland. The type species was first described as ''Saurichthys mougeoti''. Following a reinvestigation, Erik Stensiö concluded that this species cannot be ascribed to '' Saurichthys''. He thus erected a new genus, which he named after his colleague Birger Sjöström, who had joined him on an expedition to the Arctic island of Spitsbergen ( Svalbard) in 1915. Appearance The scale cover of ''Birgeria'' is reduced. Most of the body is devoid of scales. Scales are only developed on the upper lobe of the caudal fin and the hind portion of the caudal peduncle. The scales are small, rhombic and lack a ganoine layer. The heterocerc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
