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A new large beaver (Mammalia, Castoridae) from the Early Miocene of Japan
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0003-2268-5824
Swedish Museum of Natural History, Department of Zoology.
2016 (English)In: Journal of Vertebrate Paleontology, ISSN 0272-4634, E-ISSN 1937-2809Article in journal (Refereed) Epub ahead of print
Abstract [en]

A new early Miocene large castorid, Minocastor godai gen. et sp. nov., from the Dota locality, Gifu Prefecture in central Japan, is described on the basis of dentaries and teeth. The material comes from the Kani basin, where limnofluviatile clay and sandstones of the Nakamura Formation (Mizunami Group) are exposed on the southern (left) bank of the Kiso River. It represents the richest sample of a Miocene small mammal in the Japanese fossil record thus far known. Based on jaw and tooth morphology, this new castorid most likely represents a primitive anchitheriomyine. However, it lacks the marked striations on the incisors that are characteristic of the advanced large, middle Miocene anchitheriomyines like Anchitheriomys and Amblycastor. The new castorid shares this dental feature with other primitive anchitheriomyines from Asia and North America, like Propalaeocastor, Oligotheriomys, and Miotheriomys. For these genera, a new tribe, Minocastorini, is proposed as sister group to the Anchitheriomyini. The incisor enamel microstructure of the new castorid largely exhibits plesiomorphic characters but also apomorphic features such as pseudo-pauciserial Hunter-Schreger bands. Additionally, the outer portion of the enamel band is rather thick in comparison to that of other beavers. Based on the rodent taxa associated with Minocastor godai gen. et sp. nov., Dota can be correlated with European Neogene mammal units MN 3/4. Magnetostratigraphic studies and radiometric dates obtained from the Mizunami Group indicate that Dota is more likely correlated with MN 3, with an absolute age of around 18.5 Ma.

Place, publisher, year, edition, pages
Society of Vertebrate Paleontology , 2016.
Keyword [en]
Beavers, Miocene, Kani Basin, Japan, dentition, castorids
National Category
Natural Sciences Other Earth and Related Environmental Sciences
Research subject
Ecosystems and species history; Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-1740DOI: doi.org/10.1080/02724634.2016.1080720OAI: oai:DiVA.org:nrm-1740DiVA: diva2:913952
Funder
The Royal Swedish Academy of Sciences
Available from: 2016-03-23 Created: 2016-03-23 Last updated: 2016-04-14Bibliographically approved

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