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Incisor enamel microstructure places New and Old World Eomyidae outside Geomorpha (Rodentia, Mammalia)
Swedish Museum of Natural History, Department of Zoology. Department of Zoology Swedish Museum of Natural History Stockholm Sweden.ORCID iD: 0000-0003-2439-5484
Geological‐Paleontological Institute Karls University Prague Czech Republic.
Department of Geology and Paleontology National Museum of Nature and Science Tsukuba Japan;Institut Català de Paleontologia Miquel Crusafont Universitat Autònoma de Barcelona Barcelona Spain.ORCID iD: 0000-0002-7621-9901
Division of Vertebrate Paleontology University of Nebraska State Museum Lincoln Nebraska USA.
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2022 (English)In: Zoologica Scripta, ISSN 0300-3256, E-ISSN 1463-6409, Vol. 51, no 4, p. 381-400Article in journal (Refereed) Published
Abstract [en]

The lower incisor enamel microstructure of the fossil rodent family Eomyidae was believed to be three-layered and highly derived but rather uniform throughout the clade. Here, we describe a new four-layered schmelzmuster in Eomyidae consisting of a three-fold portio interna with longitudinal oriented, uniserial Hunter-Schreger bands and a one-fold portio externa, accounting for a unique enamel microstructure character combination in Rodentia. This new schmelzmuster type has developed early in eomyid evolution and is detectable already in the late Eocene (Chadronian) of North America. In European eomyids, it first occurs in the early Miocene (MN 3), implying that this four-layered schmelzmuster was not present in all members of the family but restricted to species included in Eomyini and some genera currently considered Eomyidae incertae sedis within Eomyidae. Additionally, our analysis recognizes three taxa with schmelzmuster divergent from all other eomyids. Incisor enamel microstructure does not advocate a close phylogenetic relationship of Eomyidae to either fossil or extant Heteromyidae and Geomyidae, nor to fossil Heliscomyidae and Florentiamyidae. Our results rather support the view that Eomyidae are placed outside Geomorpha.

Place, publisher, year, edition, pages
2022. Vol. 51, no 4, p. 381-400
Keywords [en]
Enamel microstructure, Eurasia, Neogene, North America, Paleogene, schmelzmuster
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Other Biological Topics
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-4957DOI: 10.1111/zsc.12541OAI: oai:DiVA.org:nrm-4957DiVA, id: diva2:1717206
Funder
German Research Foundation (DFG), KA 1556/2‐1German Research Foundation (DFG), KA 1556/2‐2Available from: 2022-12-07 Created: 2022-12-07 Last updated: 2022-12-07Bibliographically approved

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Kalthoff, Daniela C.Kimura, YuriMörs, Thomas
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