Protoscaphirhynchus

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Protoscaphirhynchus
Systematics
Ray fins (Actinopterygii)
Cartilage organoids (chondrostei)
Sturgeon (Acipenseriformes)
Sturgeon (Acipenseridae)
Shovel sturgeon (Scaphirhynchinae)
Protoscaphirhynchus
Scientific name
Protoscaphirhynchus
Wilimovsky , 1956

Protoscaphirhynchus is a prehistoric genus of ray fins that is closely related to today's paddle sturgeon . So far it is only known from the late Cretaceous Hell Creek Formation in the northwest of the USA . The only known species is Protoscaphirhynchus squamosus .

origin

The fossils were found in sandstone in the Hell Creek Formation (Bear Creek / Rock Creek), 39 km southeast of Fort Peck, Montana , in 1938 when a paleontological expedition from the University of Michigan Museum of Paleontology searched the site. The fossils were close to the holotype specimens of the also extinct species Paleopsephurus wilsoni . The "Specimen UMMP 22210", which is kept in the collection of the Museum of Paleontology at the University of Michigan at Ann Arbor , is part of the skeleton.

Systematics

The genus is characterized by the fact that, on the one hand, the typical physique of Scaphirhynchus is recognizable, while on the other hand, the entire body seems to be covered with bone plates, which are otherwise only present as individual rows in today's sturgeon species .

Surname

The name of the genus and the species is composed of several Latin and Greek terms:

  • Proto - from Latin "first, first, in advance, originally"
  • scapha from Latin "boat" (boat-shaped)
  • rhynchos from Greek "Rhino" (ῥινό) nose

and

  • squamosus from Latin "scaly".

Individual evidence

  1. ↑ Jack Sepkoski: A compendium of fossil marine animal genera. In: Bulletins of American Paleontology. vol. 363 2002: 1-560. [1]
  2. ↑ Archie MacAlpin: Paleopsephurus wilsoni , a new polyodontid fish from the Upper Cretaceous of Montana, with a discussion of allied fish, living and fossil . In: Contributions from the Museum of Paleontology, University of Michigan . 6, No. 8, 1947, pp. 167-234. ( online )
  3. ↑ Protoscaphirhynchus squamosus in the Paleobiology Database .
  4. ↑ NJ Wilimovsky: Protoscaphirhynchus squamosus, a new sturgeon from the Upper Cretaceous of Montana. In: Journal of Paleontology 30 (5), 1956: 1205.
  5. ↑ wiktionary.org .
  6. ↑ pons.com .

literature

  • NJ Wilimovsky: Protoscaphirhynchus squamosus, a new sturgeon from the Upper Cretaceous of Montana. In: Journal of Paleontology 30 (5), 1956: 1205-1208. Abstract .
  • L. Grande, EJ Hilton 2006.