Description and palaeobiology of a new species of Libycosaurus (Cetartiodactyla, Anthracotheriidae) from the Late Miocene of Toros-Menalla, northern Chad

F. Lihoreau; J.-R. Boisserie; C. Blondel; L. Jacques; A. Likius; H. T. Mackaye; P. Vignaud; M. Brunet

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Description and palaeobiology of a new species of Libycosaurus (Cetartiodactyla, Anthracotheriidae) from the Late Miocene of Toros-Menalla, northern Chad

机译：乍得北部Toros-Menalla中新世晚期的一种新的利比亚龙（Cetartiodactyla，Anthracotheriidae）的描述和古生物学

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The analysis of a large sample of anthracothere remains discovered by the Mission Paleoanthropologique Franco-Tchadienne at Toros-Menalla ™, Northern Chad, has revealed the occurrence of a single species with a large intraspecific morphological variability. Taxonomic problems triggered the necessity of naming a new species for the TM anthracotheres, Libycosaurus bahri sp. Nov. The description of the craniodental remains and the analysis of their variability indicate a marked sexual dimorphism, most probably induced by sex differential growth, helping to reassess the specific diversity of Libycosaurus and its main evolutionary trends in a phylogenetic perspective. The ecological niche occupied by the new species was also further characterized in its semiaquatic, behavioural, and dietary dimensions. On these grounds we suggest that Late Miocene environmental changes, particularly habitat opening and hydrographic network fragmentation related to increased aridity, played a major role in canalizing semi-aquatic specializations and the extinction of the last African anthracotheres, as well as other bothriodontines.

机译：乍得北部的Toros-Menalla™的人类古生物学团Franco-Tchadienne所发现的大量炭疽残留物的分析表明，单个物种的种内形态差异很大。分类学问题引发了有必要为TM炭疽热母命名为Libycosaurus bahri sp。 11月。对颅牙残骸的描述及其变异性分析显示出明显的性二态性，很可能是由性别差异性增长引起的，有助于从系统发育角度重新评估利比龙的特定多样性及其主要进化趋势。新物种所占据的生态位在半水生，行为和饮食方面也得到了进一步表征。基于这些理由，我们建议中新世晚期的环境变化，特别是与干旱增加有关的栖息地开放和水文网络破碎化，在半水生专门化渠道的发展和最后的非洲炭疽母以及其他七齿类动物的灭绝中发挥了重要作用。

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《Journal of Systematic Palaeontology》 |2014年第8期|761-798|共38页
作者
F. Lihoreau; J.-R. Boisserie; C. Blondel; L. Jacques; A. Likius; H. T. Mackaye; P. Vignaud; M. Brunet;
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作者单位

Institut des Sciences de l'Evolution de Montpellier, ISEM UMR CNRS 5554, Universite Montpellier 2, Place Eugene Bataillon, F-34095 Montpellier Cedex 5, France;

Institut International de Paleoprimatologie, Paleontologie Humaine: Evolution et Paleoenvironnements, IPHEP UMR CNRS 7262, Universite de Poitiers, 40 Avenue du recteur Pineau, 86022 Poitiers Cedex, France,Centre Francais des Etudes Ethiopiennes, USR CNRS 3137, Ambassade de France en Ethiopie, P.O. Box 5554 Addis Ababa, Ethiopia;

Institut International de Paleoprimatologie, Paleontologie Humaine: Evolution et Paleoenvironnements, IPHEP UMR CNRS 7262, Universite de Poitiers, 40 Avenue du recteur Pineau, 86022 Poitiers Cedex, France;

Institut International de Paleoprimatologie, Paleontologie Humaine: Evolution et Paleoenvironnements, IPHEP UMR CNRS 7262, Universite de Poitiers, 40 Avenue du recteur Pineau, 86022 Poitiers Cedex, France;

Departement de Paleontologie, FSEA, Universite de N'Djamena, BP 1117 N'Djamena, Tchad;

Departement de Paleontologie, FSEA, Universite de N'Djamena, BP 1117 N'Djamena, Tchad;

Institut International de Paleoprimatologie, Paleontologie Humaine: Evolution et Paleoenvironnements, IPHEP UMR CNRS 7262, Universite de Poitiers, 40 Avenue du recteur Pineau, 86022 Poitiers Cedex, France;

Institut International de Paleoprimatologie, Paleontologie Humaine: Evolution et Paleoenvironnements, IPHEP UMR CNRS 7262, Universite de Poitiers, 40 Avenue du recteur Pineau, 86022 Poitiers Cedex, France,Chaire de paleontologie humaine, College de France, 3, Rue d'Ulm, 75231 Paris Cedex 05, France;

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正文语种 eng
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关键词
semi-aquatic; palaeodiet; sexual dimorphism; niche partitioning;

机译：半水生的古生物学性二态性生态位分区;

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Description and palaeobiology of a new species of Libycosaurus (Cetartiodactyla, Anthracotheriidae) from the Late Miocene of Toros-Menalla, northern Chad

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