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A new Early Cretaceous tritylodontid (Synapsida, Cynodontia, Mammaliamorpha) from the Kuwajima Formation (Tetori Group) of central Japan

2016; Taylor & Francis; Volume: 36; Issue: 4 Linguagem: Inglês

10.1080/02724634.2016.1112289

1937-2809

Hiroshige MATSUOKA, Nao Kusuhashi, Ian J. Corfe,

Paleontology and Evolutionary Biology

We describe tritylodontid remains from the Lower Cretaceous Kuwajima Formation (Tetori Group) in central Japan as representing a new genus, Montirictus kuwajimaensis, gen. et sp. nov. Montirictus is a medium-sized tritylodontid genus characterized by upper cheek teeth having the cusp formula 2-2-2 with subequal cusps, buccal and lingual cusps retaining a crescentic shape with both buccal and lingual ridges anteriorly, and ‘V’-shaped buccolingual cross-sections of two anteroposterior grooves between the three cusp rows. Tentative dating of the Kuwajima Formation to the Barremian–Aptian makes it the stratigraphically youngest representative of a long-lived, globally distributed and abundant mammaliamorph lineage and extends the known geographic range of tritylodontids.http://zoobank.org/urn:lsid:zoobank.org:pub:DE3038A4-6C14-4214-9618-BF9F097A4DD4Citation for this article: Matsuoka, H., N. Kusuhashi, and I. J. Corfe. 2016. A new Early Cretaceous tritylodontid (Synapsida, Cynodontia, Mammaliamorpha) from the Kuwajima Formation (Tetori Group) of central Japan. Journal of Vertebrate Paleontology. DOI: 10.1080/02724634.2016.1112289.