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. 2020 Sep 14;3:509. doi: 10.1038/s42003-020-01205-8

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a The location of the Erlian Basin of Inner Mongolia, China; b Paleogene fossil localities in the Erlian Basin. 1, Houldjin; 2, Arshanto; 3, Irdin Manha; 4, Daoteyin Obo; 5, Duheminboerhe; 6, Nuhetingboerhe; 7, Wulanboerhe; 8, Huheboerhe; 9, Chaganboerhe; 10, Bayan Ulan; 11, Nom Khong. The red dots refer to the localities where new materials were found. c Distributions of early controversial and unequivocal rhinocerotoids and new material from the early Eocene and early–middle Eocene in the Erlian Basin. The dark blue bars and stars show the distributions of new rhinocerotoids from the Erlian Basin. The light blue, gray, and green bars represent previously described early rhinocerotoids (or controversial rhinocerotoids) known from Asia and North America. Abbreviations: A. Amynodontidae, Br. Bridgerian, Forst. Forstercooperiidae, Rhino. Rhinocerotoidea.