A New Species of Gomphos (Glires, Mammalia) from the Eocene of the Erlian Basin, Nei Mongol, China Author Meng, Jin Author Kraatz, Brian P. Author Wang, Yuanqing Author Ni, Xijun Author Gebo, Daniel L Author Beard, K. Christopher text American Museum Novitates 2009 2009-11-30 3670 1 12 http://www.bioone.org/doi/abs/10.1206/673.1 journal article 5778 10.1206/673.1 18b68489-7260-4697-942e-f4034183fe70 0003-0082 4712995 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.
Length Width Field site
P4 (V14671.1) 2.22 3.38 (H2A)
M1 ( V14669 ) 2.87 4.57 (H2A, holotype)
M1 (V14671.2) 2.74 4.30 (H2)
M2 (V14671.3) 3.38 4.08 (H2A)
M2 (V14671.4) 3.56 4.03 (060722WYQ01)
m1 ( V14670 ) 3.30 3.30 (H2)
m1 (V14672.1) 2.84 2.70 (060720BB01)
m2 (V14672.2) 3.31 3.24 (H2A)
m3 (V14672.3) 3.46 3.32 (H2)
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.