DEPERETELLIDAE RADINSKY, 1965
Teleolophus Matthew and Granger, 1925c
Four species of
Teleolophus
have been reported from the Erlian Basin.
Teleolophus primarius
and T.? rectus are known from the Arshanto Formation in Huheboerhe area ( Qi, 1987). The material of
Teleolophus primarius
is composed of several fragmentary mandibles, carpals, and phalanges from Wulanboerhe and Huheboerhe.
Teleolophus
? rectus is known from a left mandible with p4–m1 (IVPP V 5766) from Wulanboerhe ( Qi, 1987).
Teleolophus medius
, including the holotype, was reported from the Irdin Manha Formation at the Irdin Manha escarpment, and is known mainly from mandibles. Radinsky (1965) also assigned several upper dentitions (e.g., AMNH FM 26286) and a left fragmentary mandible with p3–m1 (AMNH FM 81796) to
T. medius
? from the Ulan Shireh Formation at Wulanhuxiu and Wulantaolegai. Ulan Shireh fossils of
T. medius
? are slightly smaller than Irdin Manha species, and have a slightly squarer M3. The material from Ulan Shireh provides a complete record of upper dental morphology of
Teleolophus medius
?. However, the paucity of lower teeth from Ulan Shireh hinders comparison with Irdin Manha specimens of
T. medius
, which are preserved primarily as lower dentitions. Recently, a large number of postcrania of
Teleolophus medius
? were reported from the Ulan Shireh Formation at Wulanhuxiu ( Bai et al., 2018a).
Radinsky (1965) also referred several specimens to
Teleolophus
cf.
T. medius
from both the Arshanto and Irdin Manha formations in Huheboerhe area. Whether those CAE materials from the Arshanto Formation are conspecific with
T. primarius
and/or T.? rectus named by Qi (1987) needs further investigation. Radinsky (1965) referred a right mandible with p4–m3 (AMNH FM 81852, field no. 893) to
Teleolophus sp.
from the “?Houldjin gravels” at Huheboerhe. This specimen is similar to
T. medius
, but is about 20% larger.
Teleolophus
magnum, known from a maxilla and a mandible (AMNH FM 26063), has been reported from the base of the “Middle Red” at Erden Obo ( Radinsky, 1965). The morphology of T. magnum is somewhat intermediate between
T. medius
and
Deperetella cristata
. However, its stratigraphic horizon is even higher than that bearing
D. cristata ( Radinsky, 1965)
. Radinsky (1965) proposed three explanations for this discrepancy, and the possibility that the reported horizon bearing
T. mangus
is incorrect cannot be excluded.
Deperetella Matthew and Granger, 1925b
Only one species of
Deperetella
,
D. cristata
, is known from the Shara Murun Formation at Ula Usu.
Deperetella cristata
is represented by maxillae, mandibles, and many postcraninal elements ( Radinsky, 1965). Radinsky (1965) referred a mandible with dp3–m1 (AMNH FM 26027) to
Deperetella
cf.
D. cristata
from “Shara Murun beds” at Twin Obos. This specimen is about 25% larger than Ula Usu fossils of
D. cristata
. Radinsky (1965) further referred a right mandible with a complete dentition except for p1 (AMNH FM 81807) to
Deperetella sp.
from the “?Houldjin gravels” at Huheboerhe. This specimen was assigned to
Deperetella
rather than to
Teleolophus
mainly based on the presence of complete hypolophids on p2–4.
