Jaikosuchus Explained

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.^[1]

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.^{[2] [3]} 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.^{[4] [5]}

Notes and References

1. 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.
2. http://www.helsinki.fi/~mhaaramo/metazoa/deuterostoma/chordata/archosauria/pseudosuchia/suchia_2.html
3. 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.
4. Ezcurra . Martín D. . 2016-04-28 . The phylogenetic relationships of basal archosauromorphs, with an emphasis on the systematics of proterosuchian archosauriforms . PeerJ . en . 4 . e1778 . 10.7717/peerj.1778 . 2167-8359. free . 4860341 .
5. 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 . en . 10 . 10 . 10.1098/rsos.230387 . 2054-5703 . 10598453 . 37885992.