Gomphos Shevyreva, 1975

Meng, Jin, Kraatz, Brian P., Wang, Yuanqing, Ni, Xijun, Gebo, Daniel L & Beard, K. Christopher, 2009, A New Species of Gomphos (Glires, Mammalia) from the Eocene of the Erlian Basin, Nei Mongol, China, American Museum Novitates 3670, pp. 1-12 : 3-4

Gomphos Shevyreva, 1975

TYPE SPECIES: Gomphos elkema Shevyreva ,

1975.

INCLUDED SPECIES: Gomphos ellae and G. shevyrevae , new species.

REVISED DIAGNOSIS: Similar to other mimotonids but differing from other Glires in having two pairs of lower incisors. Differs from Mimotona ( Li, 1977) in its larger size, less transversely extended and more unilaterally hypsodont upper teeth, stronger lophs, a mesostyle usually present, lower molars with a longer trigonid, and a mesoconid on lower molars. Differs from Anatolmylus ( Averianov, 1994; Averianov and Godinot, 1998) in having a shallow horizontal ramus. Differs from Mimolagus (Bolin, 1951) in its smaller size and higher-crowned cheek teeth with distinctive cusps and ridges.

LOCALITIES AND AGE: Gomphos elkema is known from Bumbanian faunas in Tsagan- Khushu, Nemegt Basin, and Ulan-Nur Basin of Mongolia ( Dashzeveg and Russell, 1988; Dashzeveg, 1988); Huheboerhe, Wulanboerhe, and Nuhetingboerhe ( Meng et al., 2004), and Bayan Ulan (Meng et al., 2005) in the Erlian Basin of Nei-Mongol (Inner Mongolia), China. G. ellae is from Tsagaan Khutel, Mongolia ( Kraatz et al., 2009). G. shevyrevae is from the Irdin Manha Formation at Huheboerhe, Erlian. Early to Middle Eocene.