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A new endemic genus of eomyid rodents from the early Miocene of Japan
Kimura, Yuri (National Museum of Nature and Science)
Tomida, Yukimitsu (National Museum of Nature and Science)
Kalthoff, Daniela C. (Swedish Museum of Natural History)
Casanovas i Vilar, Isaac (Institut Català de Paleontologia Miquel Crusafont)
Mörs, Thomas (Swedish Museum of Natural History)
Universitat Autònoma de Barcelona

Data: 2019
Resum: Fossil rodents are generally scarce in the Miocene of Japan. However, as much as three taxa of eomyid rodents had been reported from the early Miocene Nakamura Formation (ca. 18. 5 Ma) in Gifu Prefecture, central Japan. In this study, we revisit one of them-the small-sized taxon-and assign this material to a new genus, Japaneomys, which is so far known only from the type locality. The new genus is closely related to but distinguished from Asianeomys, which is more widely distributed in Central and East Asia, by having: (i) more bunodont cheek teeth with lower lophids, yet complete transverse lophids; (ii) two-rooted p4; (iii) anterior lobe narrower than posterior lobe on m1, correspondingly synclinid I shorter and shallower than synclinid IV; (iv) hypolophid anteriorly concave on m1. Japaneomys shows a derived but peculiar four-layered enamel microstructure with longitudinally oriented Hunter-Schreger bands, compared to three-layered microstructure in typical eomyid rodents. A phylogenetic analysis indicates that Japaneomys is more basal than Asianeomys and likely diverged in the late Oligocene when Japan was still part of the eastern margin of continental Asia, suggesting that certain small mammal populations could have undergone allopatric speciation isolated from inner-continental regions of Asia.
Ajuts: MINECO/CGL2016-76431-P
MINECO/CGL2017-82654-P
MINECO/RYC-2013-12470
Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-116
Drets: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. Creative Commons
Llengua: Anglès
Document: Article ; recerca ; Versió publicada
Matèria: Mammalia ; Rodentia ; Eomyidae ; Enamel microstructure ; Dental morphology ; Time-scaled phylogeny ; Paleogeography ; Miocene ; Japan
Publicat a: Acta Palaeontologica Polonica, Vol. 64, Issue 2 (2019) , p. 303-312, ISSN 1732-2421

DOI: 10.4202/app.00558.2018


10 p, 433.2 KB

El registre apareix a les col·leccions:
Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > Institut Català de Paleontologia Miquel Crusafont (ICP)
Articles > Articles de recerca
Articles > Articles publicats

 Registre creat el 2019-11-27, darrera modificació el 2021-09-05



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