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.