Montirictus is an extinct genus of tritylodonts known from the Early Cretaceous Kuwajima Formation of Japan. It is currently the latest surviving tritylodontid species, and is closely related to the earlier Xenocretosuchus from mainland Asia, and the Jurassic Stereognathus from the UK.[1] It may be a species of the genus Stereognathus,[2] but resolution of its affinities conditions upon the discovery of additional material.[3]

Temporal range: Barremian-Aptian
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Clade: Therapsida
Clade: Cynodontia
Family: Tritylodontidae
Genus: Montirictus
Matsuoka et al., 2016
Type species
Montirictus kuwajimaensis
Matsuoka et al., 2016


  1. ^ Matsuoka, H., Kusuhashi, N., & Corfe, I.J. (July 2016). "A new early Cretaceous tritylodontid (Synapsida, Cynodontia, Mammaliamorpha) from the Kuwajima Formation (Tetori Group) of Central Japan". Journal of Vertebrate Paleontology. 36 (4): e1112289. doi:10.1080/02724634.2016.1112289.CS1 maint: uses authors parameter (link)
  2. ^ Averianov, A.O.; Martin, T.; Lopatin, A.V.; Schultz, J.A.; Skutschas, P.P.; Rico, S.; Krasnolutskii, S.A. (2017). "A tritylodontid synapsid from the Middle Jurassic of Siberia and the taxonomy of derived tritylodontids". Journal of Vertebrate Paleontology. 37 (5): e1363767. doi:10.1080/02724634.2017.1363767.
  3. ^ Panciroli, E.; Walsh, S.; Fraser, N.C.; Brusatte, S.L.; Corfe, I. (2017). "A reassessment of the postcanine dentition and systematics of the tritylodontid Stereognathus (Cynodontia, Tritylodontidae, Mammaliamorpha), from the Middle Jurassic of the United Kingdom". Journal of Vertebrate Paleontology. 37 (5): e1351448. doi:10.1080/02724634.2017.1351448.