RHINOCEROTIDAE GRAY, 1821

Bai, Bin, Wang, Yuan-Qing, Li, Qian, Wang, Hai-Bing, Mao, Fang-Yuan, Gong, Yan-Xin & Meng, Jin, 2018, Biostratigraphy and Diversity of Paleogene Perissodactyls from the Erlian Basin of Inner Mongolia, China, American Museum Novitates 2018 (3914), pp. 1-60 : 14

RHINOCEROTIDAE GRAY, 1821

Aprotodon Forster-Cooper, 1915

Only one species of Aprotodon , A. lanzhouensis , has been reported from the Houldjin Formation near the Erenhot Railway Station (Wang et al., 2009). The specimens consist of i2 (EMM 0082) and some cheek teeth (e.g., EMM 0079), and are characterized by extremely long and curved lower tusks (Wang et al., 2009).

Symphysorrhachis Beliajeva, 1954

Wang et al. (2009) referred a mandible with m2–3 (EMM 0123) and M1/2 (EMM 0078) to Symphysorrhachis sp. from the Houldjin Formation near the Erenhot Railway Station. Wang et al. (2009) further assigned an M3 (AMNH FM 19184) from Houldjin, originally referred to Caenopus or Praeaceratherium sp. by Matthew and Granger (1923a), to Symphysorrhachis sp.