Kansajsuchus

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Kansajsuchus
Temporal range: Late Cretaceous,
85 Ma
↓
Holotype premaxilla
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Archosauria
Clade: Pseudosuchia
Clade: Crocodylomorpha
Clade: Crocodyliformes
Family: †Paralligatoridae
Genus: †Kansajsuchus
Efimov, 1975
Type species
†Kansajsuchus extensus
Efimov, 1975

Kansajsuchus is an extinct genus of paralligatorid mesoeucrocodylian. It is based on PIN 2399/301, a right premaxilla, one of the bones of the tip of the snout. This specimen was found in rocks of the lower Santonian-age Upper Cretaceous Yalovach Svita of Kansai, in the Fergana Basin of Tajikistan. Additional fossils including vertebrae and bony armor have been assigned to this genus. It would have been a large animal, estimated at between 5–7 metres (16–23 ft) long.[1] Kansajsuchus was described in 1975 by Mikhail Efimov. The type species is Kansajsuchus extensus.[2]

Classification

Life restoration

Halliday et al. (2013) confirmed the validity of the species K. extensus, and its phylogenetic position among other basal goniopholidids from Asia. "Sunosuchus" shartegensis was found to represent its sister taxon, and both species were placed in a distinct lineage from the type species of Sunosuchus, S. miaoi, however with a weak support. Therefore, the authors raised the suggestion that later revisions and phylogenetic analyses would result in the abandonment of the name Kansajsuchus, and a referral of its type species to Sunosuchus.[3] However, a subsequent paper by Kuzmin et al. (2019) showed that Kansajsuchus is a member of the family Paralligatoridae.[1]

References

  1. ^ a b Ivan T. Kuzmin; Pavel P. Skutschas; Elizaveta A. Boitsova; Hans-Dieter Sues (2019). "Revision of the large crocodyliform Kansajsuchus (Neosuchia) from the Late Cretaceous of Central Asia". Zoological Journal of the Linnean Society. 185 (2): 335–387. doi:10.1093/zoolinnean/zly027.
  2. ^ Storrs, G. W.; Efimov, M. B. (2000). "Mesozoic crocodyliforms of north-central Eurasia". In Michael J. Benton; Mikhail A. Shishkin; David M. Unwin; Evgenii N. Kurochkin (eds.). The Age of Dinosaurs in Russia and Mongolia. Cambridge University Press. pp. 402–419.
  3. ^ Halliday, T. (2013). "A re-evaluation of goniopholidid crocodylomorph material from Central Asia: Biogeographic and phylogenetic implications" (PDF). Acta Palaeontologica Polonica. doi:10.4202/app.2013.0018.


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