Jaikosuchus

Jaikosuchus
Temporal range: 251.3 –247.2 Ma[1]
↓
Early Triassic (Olenekian)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Archosauromorpha
Clade: Archosauriformes
Family: †Proterosuchidae
Subfamily: †Chasmatosuchinae
Genus: †Jaikosuchus
Sennikov, 1990
Species:
†J. magnus
Binomial name
†Jaikosuchus magnus
(Ochev, 1979)
Synonyms

Chasmatosuchus magnus Ochev, 1979

Jaikosuchus is an extinct genus of proterosuchid archosauriform. It contains a single species, J. magnus. Fossils have been found from European Russia that date back to the upper Olenekian stage of the Early Triassic.[2]

The genus was originally assigned as a new species of the proterosuchid Chasmatosuchus in 1979, but was later put in its own genus in 1990. It has often been described as an erythrosuchid, a rauisuchian or a basal suchian closely related to rauisuchians rather than the more traditional view of it being a more primitive archosaur.[3][4] In 2016, it was synonymized again with Chasmatosuchus by Ezcurra et al., but was revived as a distinct genus by Ezcurra et al. again in a 2023 overview of proterosuchid taxonomy, who found its vertebral morphology to be distinct from that of Chasmatosuchus. Both were placed in the new subfamily Chasmatosuchinae.[5][6]

  1. ^ "†Chasmatosuchus magnus Ochev 1979 (archosauromorph)". Fossilworks.
  2. ^ Shishkin, M. A., Ochev, V. G., Lozovskii, V. R. and Novikov, I. V. (2000). Tetrapod biostratigraphy of the Triassic of Eastern Europe. In: M. J. Benton, E. N. Kurochkin, M. A. Shishkin, D. M. Unwin (eds.), The Age of Dinosaurs in Russia and Mongolia. Cambridge University Press, Cambridge. pp. 140–159.
  3. ^ http://www.helsinki.fi/~mhaaramo/metazoa/deuterostoma/chordata/archosauria/pseudosuchia/suchia_2.html
  4. ^ Borsuk-Bialynicka, M., Cook, E., Evans, S. E. and Maryafiska, T. (1999). A microvertebrate assemblage from the Early Triassic of Poland. Acta Palaeontologica Polonica 44(2):167-188.
  5. ^ Ezcurra, Martín D. (2016-04-28). "The phylogenetic relationships of basal archosauromorphs, with an emphasis on the systematics of proterosuchian archosauriforms". PeerJ. 4: e1778. doi:10.7717/peerj.1778. ISSN 2167-8359. PMC 4860341.
  6. ^ Ezcurra, Martín D.; Bandyopadhyay, Saswati; Sengupta, Dhurjati P.; Sen, Kasturi; Sennikov, Andrey G.; Sookias, Roland B.; Nesbitt, Sterling J.; Butler, Richard J. (25 October 2023). "A new archosauriform species from the Panchet Formation of India and the diversification of Proterosuchidae after the end-Permian mass extinction". Royal Society Open Science. 10 (10). doi:10.1098/rsos.230387. ISSN 2054-5703. PMC 10598453. PMID 37885992.