Chasmatosuchus

Chasmatosuchus Temporal range: Early Triassic, Olenekian PreꞒ Ꞓ O S D C P T J K Pg N ↓
Life restoration of Chasmatosuchus rossicus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Archosauromorpha
Clade:	Archosauriformes
Family:	†Proterosuchidae
Subfamily:	†Chasmatosuchinae
Genus:	†Chasmatosuchus Huene, 1940
Species
†Chasmatosuchus rossicus Huene, 1940 (type) ?†Chasmatosuchus vjushkovi Ochev, 1961

Chasmatosuchus was an archosauriform reptile from the early Triassic period of European Russia. One of the earliest described archosauriforms, it was over 2 m long and is thought to have behaved like a modern crocodile.^[1] Its mouth had two distinct features: the top of its jaw hooked downwards to aid in holding prey, and the upper palate was lined with a row of teeth—a primitive feature lost in later archosaurs.^[2]

Chasmatosuchus was formerly assigned to Proterosuchidae, but a 2016 cladistic analysis by Martin Ezcurra could not confidently place the species of Chasmatosuchus within Proterosuchidae. Instead their position was found to be unresolved due to the fragmentary nature of the known material, however Chasmatosuchus is more likely to be intermediate between proterosuchids and erythrosuchids and possibly closely related to Sarmatosuchus otschevi and Cuyosuchus huenei. Ezcurra (2016) could only place C. rossicus and C. magnus within Chasmatosuchus with certainty, while the third valid species "C." vjushkovi potentially does not belong to Chasmatosuchus and may represent a proterosuchid. Gamosaurus and Jaikosuchus were found to be subjective junior synonyms of Chasmatosuchus.^[3] However, a 2023 study, also by Ezcurra et al, found Chasmatosuchus to be a true proterosuchid, distinct from Gamosaurus and Jaikosuchus based on vertebral differences, and that all three belonged to a new subfamily of the Proterosuchidae, the Chasmatosuchinae.^[4]

Chasmatosuchus parvus, based on an anterior cervical vertebra, was synonymized with Macrocnemus in 1995.^[5]

References

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Archosauromorpha

Kingdom: Animalia Phylum: Chordata Class: Sauropsida Clade: Diapsida Clade: Sauria Clade: Archelosauria
Sauropsida see Sauropsida Archosauromorpha see below↓

Archosauromorpha
Archosauromorpha †Aenigmastropheus †Czatkowiella †Elachistosuchus? †Elessaurus †Malutinisuchus †Mecistotrachelos †Prolacertoides †Protorosaurus †Rhombopholis †Vritramimosaurus †Tanysauria Jesairosaurus? Trachelosauridae Austronaga Dinocephalosaurus Fuyuansaurus? Gracilicollum? Protanystropheus Pectodens Sclerostropheus? Trachelosaurus Sharovipterygidae? Ozimek Sharovipteryx Tanystropheidae Amotosaurus Augustaburiania Cosesaurus Fuyuansaurus? Gracilicollum? Gwyneddosaurus Langobardisaurus Luxisaurus Macrocnemus Raibliania Sclerostropheus? Tanystropheus Tanytrachelos Sharovipterygidae? Crocopoda †Boreopricea †Cryptovaranoides? †Tasmaniosaurus †Teyujagua †Allokotosauria see Allokotosauria †Rhynchosauria see Rhynchosauria †Prolacertidae? Kadimakara Prolacerta Archosauriformes see below↓

Archosauriformes
Archosauriformes †Antarctanax †Cuyosuchus †Eorasaurus? †Kalisuchus †Koilamasuchus †Sarmatosuchus †Syntomiprosopus †Proterosuchidae Archosaurus Chasmatosuchus? Gamosaurus Jaikosuchus Proterosuchus Samsarasuchus Tsylmosuchus? Vonhuenia? †Protopyknosia Kranosaura Triopticus †Erythrosuchidae Bharitalasuchus Chalishevia Erythrosuchus Fugusuchus? Garjainia Guchengosuchus Shansisuchus Uralosaurus Eucrocopoda †Asperoris †Dorosuchus †Heteropelta †Litorosuchus †Marcianosuchus †Polymorphodon †Vancleavea †Euparkeriidae Euparkeria Halazhaisuchus Osmolskina †Proterochampsia see Proterochampsia Crurotarsi †Phytosauria see Phytosauria Archosauria Incertae sedis †Sikannisuchus? †Smok Avemetatarsalia see Avemetatarsalia includes birds Pseudosuchia see Pseudosuchia includes crocodilians

Related topics

Tooth taxa †Crosbysaurus †Lucianosaurus †Tecovasaurus †Palaeosaurus †Protecovasaurus †Uatchitodon †Zanclodon Nomina dubia †Albisaurus †Ankistrodon †Avipes †Blomosuchus †Collilongus †Exilisuchus †Fenhosuchus †Megacnemus †Microcnemus †Vjushkovisaurus †Wangisuchus Paraphyletic groups Proterosuchia Protorosauria Thecodontia Possible members Choristodera Drepanosauromorpha Kuehneosauridae Ichthyosauromorpha Sauropterygia Thalattosauria

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