Paraophthalmosaurus [1] ( lat. Paraophthalmosaurus , from para - near and Ophthalmosaurus , literally close to an ophthalmosaurus ) - a genus of Upper Jurassic ( Titonian century ) ichthyosaurs from the family of ophthalmosaurus . The name was given due to the similarity and close relationship with the ophthalmosaurus. The fossils of the paraophthalmosaurus were found in European Russia - a territory that at the end of the Jurassic period was part of the ancient Tethys Ocean. At the same time as the paraophthalmosaurus in the same part of the ocean, its closest relatives met - the ophthalmosaurus ( Ophthalmosaurus ) and the undorosaurus [2] ( Undorosaurus ).
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Content
- 1 Study
- 2 Types
- 3 See also
- 4 notes
Learning
The genus was described by Maxim Arkhangelsky in 1997. In the future, some researchers expressed their synonyms with the ophthalmosaurus, but in 2014 Arkhangelsky and Zverkov determined its validity and, together with the undoraosaurus, assigned it to the subfamily Ophthalmosaurinae [3] . The paraophthalmosaurus differs from the ophthalmosaurus and the undorosaurus in the structure of the fins, as well as in its smaller size: its largest humerus (sample UPM EP-II-16 (1202) from the vicinity of the Settlements in the Ulyanovsk Region ) is 9 cm long and belongs to an adult [3] . The length of the animal ranged from 2 [4] to 4 m [5] . In 2015, Zverkov, Arkhangelsk, and Stenshin conditionally combined the paraophthalmosaurus, the undorosaur, and cryopterygia [6] ( Cryopterygius ) from Spitsbergen in the clade Paraophthalmosaurini , and the ophthalmosaurus and acamptonectes [7] ( Acamptonectduphis 8thal ) 8th in .
Views
- Paraophthalmosaurus saveljeviensis is a type species, known for its partial skull, vertebrae, humerus and fins, found in Tithonian deposits near the village of Gorny in the Saratov Region [9] [10] . The species name is given in honor of the Savelyevsky shale mine [5] [10] .
- Paraophthalmosaurus saratoviensis — known for its fragmentary skeleton without a skull [9] from the same location as P. saveljeviensis , which may be synonymous with [10] . The holotype length (PRM 2836) is estimated at approximately 2 m [4] .
- Paraophthalmosaurus kabanovi (originally assigned to the genus Yasykovia [3] ) - found in Tithonian sediments near Ulyanovsk . Known for several samples containing the remains of skulls, flippers, humerus and vertebrae. Named in honor of the paleontologist K. Kabanov [11] .
See also
- Ichthyosaur list
Notes
- ↑ Paraophthalmosaurs , “Encyclopedia of Nature of the Samara Region”
- ↑ Undorosaurs , "Encyclopedia of Nature of the Samara Region"
- ↑ 1 2 3 Arkhangelsky MS and Zverkov NG 2014. On a new ichthyosaur of the genus Undorosaurus (inaccessible link) . Proceedings of the Zoological Institute RAS 318 (5): 187-196.
- ↑ 1 2 Arkhangelsky MS On the Ichthyosaurian Fossils from the Volgian Stage of the Saratov Region (PDF). Saratov State University .
- ↑ 1 2 Arkhangelsk M.S., Ivanov A.V., Nelikhov A.E. 2012. When the Volga river was the Sea (PDF). Saratov State Technical University Publ. DOI : 10.13140 / 2.1.4116.3048 .
- ↑ Paleontology news. A new type of ophthalmosauride cryopterygia from the Late Jurassic (Lower Tithon) of Poland is described - Cryopterygius kielanae , Dinosaurs.afly.ru Forum
- ↑ Sveltonectes and Acamptonectes - new Cretaceous ichthyosaurs
- ↑ Zverkov NG, Arkhangelsky MS and Stenshin IM 2015. A review of Russian Upper Jurassic ichthyosaurs with an intermedium / humeral contact. Reassessing Grendelius McGowan, 1976 . Proceedings of the Zoological Institute 318 (4): 558-588.
- ↑ 1 2 Storrs GW, Arkhangel'skii MS, and Efimov VM 2000. Mesozoic marine reptiles of Russia and other former Soviet republics . In MJ Benton, MA Shishkin, DM Unwin, EN Kurochkin (eds.), The age of dinosaurs in Russia and Mongolia 187-210.
- ↑ 1 2 3 Paraophthalmosaurus , www.paleofile.com.
- ↑ Yasykovia , www.paleofile.com.