Riojanodon

Riojanodon; Temporal range: Triassic PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Clade:	Therapsida
Clade:	Cynodontia
Family:	† Chiniquodontidae
Genus:	† Riojanodon
Species:	†R. nenoi
Binomial name
	†Riojanodon nenoi; Martinelli et. al., 2024

Last updated August 14, 2025

Riojanodon is an extinct genus of chiniquodontid cynodont that inhabited what is now Argentina during the latest Middle and earliest Late Triassic epochs. It is a monotypic genus known from the species R. nenoi.^[1]

Phylogeny

The cladogram below is from the study that described Riojanodon.^[1]

References

1 2 Martinelli, Agustín G.; Ezcurra, Martín D.; Fiorelli, Lucas E.; Escobar, Juan; Hechenleitner, E. Martín; von Baczko, M. Belén; Taborda, Jeremías R. A.; Desojo, Julia B. (29 January 2024). "A new early-diverging probainognathian cynodont and a revision of the occurrence of cf. Aleodon from the Chañares Formation, northwestern Argentina: New clues on the faunistic composition of the latest Middle–?earliest Late Triassic Tarjadia Assemblage Zone" . The Anatomical Record . 307 (4): 818–850. doi:10.1002/ar.25388. ISSN 1932-8486. PMID 38282519 . Retrieved 14 December 2024– via American Association for Anatomy.

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[Riojanodon-1] 1 2 Martinelli, Agustín G.; Ezcurra, Martín D.; Fiorelli, Lucas E.; Escobar, Juan; Hechenleitner, E. Martín; von Baczko, M. Belén; Taborda, Jeremías R. A.; Desojo, Julia B. (29 January 2024). "A new early-diverging probainognathian cynodont and a revision of the occurrence of cf. Aleodon from the Chañares Formation, northwestern Argentina: New clues on the faunistic composition of the latest Middle–?earliest Late Triassic Tarjadia Assemblage Zone" . The Anatomical Record . 307 (4): 818–850. doi:10.1002/ar.25388. ISSN 1932-8486. PMID 38282519 . Retrieved 14 December 2024– via American Association for Anatomy.

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