Английская Википедия:Boreosomus
Шаблон:Short description Шаблон:For Шаблон:Italic title Шаблон:Taxobox Boreosomus (meaning: "boreal body") is an extinct genus of Triassic ray-finned fish. It was first described from the Arctic island of Spitsbergen (Svalbard, Norway), but was later also discovered in other parts of the world. The type species is Boreosomus arcticus (= Acrolepis arctica Woodward, 1912).
Classification
Boreosomus belongs to the family Ptycholepidae (= Boreosomidae/Chungkingichthyidae). Other genera of this family are Acrorhabdus (Spitsbergen), Ardoreosomus (Nevada, United States), Chungkingichthys (China), Ptycholepis (global) and Yuchoulepis (China).[1]
Description
A characteristic feature of Boreosomus and other ptycholepids is the dorsal fin, which inserts at the level of the pelvic fins in the middle portion of the body. Most contemporary ray-fins have their dorsal fin in a more posterior position, often opposite to the anal fin. Also typical for ptycholepids are the somewhat rectangular, horizontally arranged suborbital bones.[2]
Fossil record
Boreosomus had a worldwide distribution during the Early Triassic and is also known from the Middle and Late Triassic. Fossils of Boreosomus were found, apart from Spitsbergen (Svalbard), in Greenland, Madagascar, Kenya, China (Shaanxi), Spain (Catalonia), United States (Alaska, Nevada), and Canada (Alberta, British Columbia, Nunavut).[3][4]
Species
- Шаблон:ExtinctBoreosomus arcticus (Woodward, 1912) [Acrolepis arctica Woodward 1912] (type species)
- Шаблон:ExtinctBoreosomus gillioti (Priem, 1924) [Diaphorognathus gillioti (Priem 1924); Gyrolepis gillioti Priem 1924]
- Шаблон:ExtinctBoreosomus merlei Beltan, 1957
- Шаблон:ExtinctBoreosomus piveteaui Nielsen, 1942[2]
- Шаблон:ExtinctBoreosomus reuterskioeldi Stensiö, 1921
- Шаблон:ExtinctBoreosomus scaber Stensiö, 1921
See also
References
Шаблон:Wikispecies Шаблон:Commons Шаблон:Reflist
Шаблон:Actinopterygian genera Шаблон:Taxonbar
Шаблон:Palaeonisciformes-stub Шаблон:Triassic-fish-stub
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