Boreosomus

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Boreosomus
Temporal range: Early Triassic
Boreosomus gillioti Priem.jpg
Boreosomus gillioti: fossil mold and latex cast
Scientific classification
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Boreosomus

Stensiö, 1921
Synonyms
  • Diaphorognathus Brough, 1933

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. 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).[2]

Description

Boreosomus gillioti, Beroroha Madagascar
Boreosomus slab and counterslab fossils at the Geological Museum in Copenhagen

The type species is Boreosomus arcticus (= Acrolepis arctica Woodward, 1912). A characteristic feature of this family 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.

Fossil record

Boreosomus had a worldwide distribution during the Early Triassic. Fossils of Boreosomus were found, apart from Spitsbergen, in Greenland, Madagascar, China, Spain, Svalbard and Jan Mayen, United States and Canada.[3]


Species

Species within this genus include:

See also

References

  1. ^ "Palaeonisciformes". Paleobiology Database. Retrieved November 17, 2012.
  2. ^ C. Romano, A. López-Arbarello, D. Ware, J. F. Jenks, and W. Brinkmann. 2019. Marine Early Triassic Actinopterygii from the Candelaria Hills (Esmeralda County, Nevada, USA). Journal of Paleontology 93:971-1000 https://doi.org/10.1017/jpa.2019.18
  3. ^ "Fossilworks: Boreosomus".

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