Mandibular characteristics of early Glires (Mammalia) reveal mixed rodent and lagomorph morphotypes

Author:

Fostowicz-Frelik Łucja12ORCID,Cox Philip G.3ORCID,Li Qian45ORCID

Affiliation:

1. Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA

2. Institute of Paleobiology, Polish Academy of Sciences, 00-818 Warsaw, Poland

3. Centre for Integrative Anatomy, Department of Cell and Developmental Biology, University College London, London WC1E 6BT, UK

4. Key Laboratory of Evolutionary Systematics of Vertebrates, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, People's Republic of China

5. Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Beijing 100044, People's Republic of China

Abstract

Glires (rodents, lagomorphs and their fossil kin) is the most speciose and arguably most diversified clade of living placentals. Different lineages within the Glires evolved basically opposite chewing movements: a mostly transversal power stroke in lagomorphs, and a mostly proal power stroke in rodents, but the ancestral condition for Glires is still unclear. To address this knowledge gap, we studied the mandibles of Chinese Palaeocene Glires representing the duplicidentate (lagomorph-like; Mimotona ) and simplicidentate (rodent-like; Eomylus and Heomys ) lineages. To assess the mechanical resistance of mandibles to bending and torsion, we calculated the section modulus. The dentaries differ greatly in morphology and the region where the maximum grinding force was likely applied. The early Palaeocene Mimotona lii and the middle Palaeocene Mimotona robusta and Heomys orientalis all show a pattern of increasing strength moving posteriorly along the mandible, similar to sciurids and the mountain beaver. By contrast, the late Palaeocene Eomylus sp. mandible was strongest in the m1 region, a pattern seen in lagomorphs and the stem placental Zofialestes . Our results indicate the early diversification of mandible structure of Glires, demonstrate a mixture of duplicidentate and simplicidentate characters among the basal Glires and suggest an early occurrence of a lagomorph-like morphotype. This article is part of the theme issue ‘The mammalian skull: development, structure and function’.

Funder

Narodowe Centrum Nauki

Publisher

The Royal Society

Subject

General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology

Reference56 articles.

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5. Fostowicz-Frelik Ł. 2017 Convergent and parallel evolution in early Glires (Mammalia). In Evolutionary biology: self/nonself evolution, species and complex traits evolution, methods and concepts (ed. P Pontarotti), pp. 199-216. Cham, Switzerland: Springer.

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. The mammalian skull: development, structure and function;Philosophical Transactions of the Royal Society B: Biological Sciences;2023-05-15

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