Cryopterygius
 | It has been suggested that this article be merged into Undorosaurus. (Discuss) Proposed since December 2023. |
| Cryopterygius Temporal range: Tithonian
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| Holotype of C. kristiansanae | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | †Ichthyosauria |
| Family: | †Ophthalmosauridae |
| Genus: | †Cryopterygius Druckenmiller et al., 2012 |
| Type species | |
| †Cryopterygius kristiansanae Druckenmiller et al., 2012
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Cryopterygius (meaning 'frozen fin' in Greek) is a dubious extinct genus of ophthalmosaurid ichthyosaur known from the Agardhfjellet Formation of Norway. One species is currently recognised, which is C. kristiansenae.[1]
Discovery and naming
The holotype, PMO 214.578, consists of a single, but largely complete specimen from the Slottsmøya Member of the Agardhfjellet Formation that was excavated between 2004 and 2012. Druckenmiller et al. (2012) subsequently named and described C. kristiansenae on the basis of this specimen.[1]
A second species, C. kielanae, was found in the Kcynia Formation from the Late Jurassic of Poland.[2] It has since been synonymised with Undorosaurus and was found to be a species of Undorosaurus (U. kielanae).[3]
It has also been suggested that C. kristiansenae may also be synonymous with Undorosaurus.[4]
Description
With a total length of 5–5.5 metres (16–18 ft), it has been determined that Crypoterygius was a large ichthyosaur.[1]
See also
References
- ^ a b c Patrick S. Druckenmiller; Jørn H. Hurum; Espen M. Knutsen; Hans Arne Nakrem (2012). "Two new ophthalmosaurids (Reptilia: Ichthyosauria) from the Agardhfjellet Formation (Upper Jurassic: Volgian/Tithonian), Svalbard, Norway". Norwegian Journal of Geology. 92 (2–3): 311–339. ISSN 1502-5322. Low resolution pdf Archived 2015-09-24 at the Wayback Machine High resolution pdf Archived 2015-09-24 at the Wayback Machine
- ^ Daniel Tyborowski (2016). "A new ophthalmosaurid ichthyosaur from the Late Jurassic of Owadów-Brzezinki Quarry, Poland". Acta Palaeontologica Polonica. in press. doi:10.4202/app.00252.2016.
- ^ Nikolay G. Zverkov & Vladimir M. Efimov (2019). "Revision of Undorosaurus, a mysterious Late Jurassic ichthyosaur of the Boreal Realm". Journal of Systematic Palaeontology. 17 (14): 963–993. doi:10.1080/14772019.2018.1515793. S2CID 91912834.
- ^ Miedema, Feiko; Bastiaans, Dylan; Scheyer, Torsten M.; Klug, Christian; Maxwell, Erin E. (2024-03-16). "A large new Middle Jurassic ichthyosaur shows the importance of body size evolution in the origin of the Ophthalmosauria". BMC Ecology and Evolution. 24 (1): 34. doi:10.1186/s12862-024-02208-3. ISSN 2730-7182. PMC 10944604. PMID 38493100.
External links
Media related to Cryopterygius at Wikimedia Commons