A new alligatoroid from the Eocene of Vietnam highlights an extinct Asian clade independent from extant Alligator sinensis .
| Autor: | Massonne T; Department of Geosciences, Eberhard-Karls-Universität Tübingen, Tübingen, Germany.; Senckenberg Center for Human Evolution and Palaeoecology, Tuebingen, Germany., Vasilyan D; JURASSICA Museum, Porrentruy, Switzerland.; Department of Geosciences, University of Fribourg, Fribourg, Switzerland., Rabi M; Department of Geosciences, Eberhard-Karls-Universität Tübingen, Tübingen, Germany.; Central Natural Science Collections, Martin-Luther University Halle-Wittenberg, Halle (Saale), Germany., Böhme M; Department of Geosciences, Eberhard-Karls-Universität Tübingen, Tübingen, Germany.; Senckenberg Center for Human Evolution and Palaeoecology, Tuebingen, Germany. |
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| Jazyk: | angličtina |
| Zdroj: | PeerJ [PeerJ] 2019 Nov 05; Vol. 7, pp. e7562. Date of Electronic Publication: 2019 Nov 05 (Print Publication: 2019). |
| DOI: | 10.7717/peerj.7562 |
| Abstrakt: | During systematic paleontological surveys in the Na Duong Basin in North Vietnam between 2009 and 2012, well-preserved fossilized cranial and postcranial remains belonging to at least 29 individuals of a middle to late Eocene (late Bartonian to Priabonian age (39-35 Ma)) alligatoroid were collected. Comparative anatomical study of the material warrants the diagnosis of a new taxon, Orientalosuchus naduongensis gen. et sp. nov. The combined presence of an enlarged fifth maxillary tooth, prominent preorbital ridges, a large supraoccipital exposure on the skull table, a palatine-pterygoid suture anterior to the posterior end of the suborbital fenestra, and a pterygoid forming a neck surrounding the choana is unique to this species. Unlike previous phylogenies, our parsimony analysis recovers a monophyletic Late Cretaceous to Paleogene East to Southeastern Asian alligatoroid group, here named Orientalosuchina. The group includes Orientalosuchus naduongensis , Krabisuchus siamogallicus , Eoalligator chunyii , Jiangxisuchus nankangensis and Protoalligator huiningensis , all of them sharing a medial shifted quadrate foramen aerum. The recognition of this clade indicates at least two separate dispersal events from North America to Asia: one during the Late Cretaceous by Orientalosuchina and one by the ancestor of Alligator sinensis during the Paleogene or Neogene, the timing of which is poorly constrained. Competing Interests: The authors declare that they have no competing interests. (© 2019 Massonne et al.) |
| Databáze: | MEDLINE |
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