UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

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

Fostowicz-Frelik, Lucja; Cox, Philip G; Li, Qian; (2023) Mandibular characteristics of early Glires (Mammalia) reveal mixed rodent and lagomorph morphotypes. Philosophical Transactions of the Royal Society B: Biological Sciences , 378 (1880) , Article 20220087. 10.1098/rstb.2022.0087. Green open access

[thumbnail of Fostowicz-Frelik et al 2023.pdf]
Preview
Text
Fostowicz-Frelik et al 2023.pdf - Published Version

Download (1MB) | Preview

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’.

Type: Article
Title: Mandibular characteristics of early Glires (Mammalia) reveal mixed rodent and lagomorph morphotypes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1098/rstb.2022.0087
Publisher version: https://doi.org/10.1098/rstb.2022.0087
Language: English
Additional information: © 2023 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
Keywords: Rodentia, Glires, Lagomorpha, mandible, Palaeocene, morphology
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Cell and Developmental Biology
URI: https://discovery.ucl.ac.uk/id/eprint/10169972
Downloads since deposit
32Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item