Chroniosaurus is an extinct genus of chroniosuchid stegocephalian, often considered a reptiliomorph[1] but possibly a stem-tetrapod,[2] from upper Permian (upper Tatarian age) deposits of Novgorod, Orenburg and Vologda Regions, Russia.[3] It was first named by Tverdokhlebova in 1972 and the type species is Chroniosaurus dongusensis.[3]
| Chroniosaurus Temporal range: Upper Permian
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|---|---|
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| C. dongusensis | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Reptiliomorpha (?) |
| Order: | †Chroniosuchia |
| Family: | †Chroniosuchidae |
| Genus: | †Chroniosaurus Tverdochlebova, 1972 |
| Species | |
Its lifestyle is uncertain. An early study suggested a fairly aquatic lifestyle,[4] but its femoral microanatomy[5] and dorsal dermal plates[6] suggest a rather terrestrial lifestyle.
References
edit- ^ Buchwitz, Michael; Foth, Christian; Kogan, Ilja; Voigt, Sebastian (May 2012). "On the use of osteoderm features in a phylogenetic approach on the internal relationships of the Chroniosuchia (Tetrapoda: Reptiliomorpha)". Palaeontology. 55 (3): 623–640. Bibcode:2012Palgy..55..623B. doi:10.1111/j.1475-4983.2012.01137.x.
- ^ Marjanović, David; Laurin, Michel (4 January 2019). "Phylogeny of Paleozoic limbed vertebrates reassessed through revision and expansion of the largest published relevant data matrix". PeerJ. 6: e5565. doi:10.7717/peerj.5565. ISSN 2167-8359. PMC 6322490. PMID 30631641.
- ^ a b V. K. Golubev (1998). "Revision of the Late Permian Chroniosuchians (Amphibia, Anthracosauromorpha) from Eastern Europe" (PDF). Paleontological Journal. 32 (4): 390–401.
- ^ Golubev, V. K. (1998). "Narrow-armored chroniosuchians (Amphibia, Anthracosauromorpha) from the Late Permian of Eastern Europe". Paleontological Journal. 32: 278–287.
- ^ Laurin, Michel; Girondot, Marc; Loth, Marie-Madeleine (December 2004). <0589:TEOLBM>2.0.CO;2 "The evolution of long bone microstructure and lifestyle in lissamphibians". Paleobiology. 30 (4): 589–613. Bibcode:2004Pbio...30..589L. doi:10.1666/0094-8373(2004)030<0589:TEOLBM>2.0.CO;2. ISSN 0094-8373.
- ^ Buchwitz, Michael; Witzmann, Florian; Voigt, Sebastian; Golubev, Valeriy (July 2012). "Osteoderm microstructure indicates the presence of a crocodylian-like trunk bracing system in a group of armoured basal tetrapods". Acta Zoologica. 93 (3): 260–280. doi:10.1111/j.1463-6395.2011.00502.x.
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