Chroniosaurus Explained

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]

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.

Notes and References

  1. Buchwitz . Michael . Foth . Christian . Kogan . Ilja . Voigt . Sebastian . On the use of osteoderm features in a phylogenetic approach on the internal relationships of the Chroniosuchia (Tetrapoda: Reptiliomorpha) . Palaeontology . May 2012 . 55 . 3 . 623–640 . 10.1111/j.1475-4983.2012.01137.x. 2012Palgy..55..623B .
  2. Marjanović . David . Laurin . Michel . Phylogeny of Paleozoic limbed vertebrates reassessed through revision and expansion of the largest published relevant data matrix . PeerJ . 4 January 2019 . 6 . e5565 . 10.7717/peerj.5565 . free . 30631641 . 6322490 . en . 2167-8359.
  3. V. K. Golubev . 1998 . Revision of the Late Permian Chroniosuchians (Amphibia, Anthracosauromorpha) from Eastern Europe . Paleontological Journal . 32 . 4 . 390–401 .
  4. Golubev . V. K. . Narrow-armored chroniosuchians (Amphibia, Anthracosauromorpha) from the Late Permian of Eastern Europe . Paleontological Journal . 1998 . 32 . 278–287.
  5. Laurin . Michel . Girondot . Marc . Loth . Marie-Madeleine . The evolution of long bone microstructure and lifestyle in lissamphibians . Paleobiology . December 2004 . 30 . 4 . 589–613 . 10.1666/0094-8373(2004)030<0589:TEOLBM>2.0.CO;2 . 2004Pbio...30..589L . en . 0094-8373.
  6. Buchwitz . Michael . Witzmann . Florian . Voigt . Sebastian . Golubev . Valeriy . Osteoderm microstructure indicates the presence of a crocodylian-like trunk bracing system in a group of armoured basal tetrapods . Acta Zoologica . July 2012 . 93 . 3 . 260–280 . 10.1111/j.1463-6395.2011.00502.x.

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