Genus: Ikechosaurus SIGOGNEAU-RUSSELL, 1981
Etymology: In reference to Ikecho, Inner Mongolia, and Greek, sauros, "lizard."

Species: sunailinae SIGOGNEAU-RUSSELL, 1981
= Eotomistoma multidentata YOUNG, 1964 (partim)

Holotype: IVPP 2774

Locality: Ikecho, 80 km south east of village center, Otog Qi, Ih Ju Meng, district d'Otok, Inner Mongolia, China.

Horizon: Zhidan Group.


Age: Summit of Early Cretaceous or base of Late Cretaceous.

Material: Fragment of maxilla-palatine.

Referred material:


Locality: Chabu Sumu locality, 63 km west of Otog Qi (37’52”N, 107’35”E), Inner Mongolia, China.

Horizon: Laohongdon Formation, Zhidan Group.


Age: Early Cretaceous.


IVPP 9611-1: Skull presacral vertebral column, shoulder girdle, left forelimb and gastralia of a juvenile.

IVPP 9611-2: Partial skeleton including an incomplete skull, vertebral column, and parts of fore and hind limbs.

IVPP 9611-3: Skull missing tip of snout, anterior 8 cervical vertebrae and ribs.

IVPP 9611-4: Partial skeleton including last 3 dorsal vertebrae, sacrum, and base of tail.

IVPP 9611-5: Partial skeleton including sacrum, partial pelvis, right hind limb and first 11 caudal vertebrae.


Locality: Laolonghuoze Locality, 53 km west of Hanggin Qi, Inner Mongolia, China.

Horizon: Laohongdon Formation, Zhidan Group.


Age: Early Cretaceous.


IVPP V10596.1: Isolated parabasiphenoid.

IVPP V10596.2: Isolated right parasbasisphenoid.

IVPP V10596.3: Coronoid region of lower jaw.

IVPP V10596.4: Posterior end of lower jaw.

IVPP V10596.5: 19 centra and 2 isolated neural arches.

IVPP V10596.6: 1 dorsal rib.

IVPP V10596.7: 1 sacral rib.

IVPP V10596.8: 1 caudal rib.

IVPP V10596.9: 2 isolated ribs.

IVPP V10596.10: Fifth metatarsal.


Species: magnus (EFIMOV, 1975) SIGOGNEAU-RUSSELL, 1981
Etymology: Latin, magnus, "large, great."
= Tchoiria magna EFIMOV, 1975

Holotype: PIN 559/501

Locality: Khamaryn Khural, Eastern-Gobi Aimag, South-eastern Mongolia.

Horizon: Upper Huhteeg Gorizont, Zuunbayan (Sainshand) Svita.


Age: Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous, Early Cretaceous.

Material: Dentary fragment.

Species: gaoi LU, KOBAYASHI & LI, 1999
Etymology: In honor of Gao Dian-Min, who found the holotype in 1993.

Holotype: IVPP V11477

Locality: Chifeng city, Yikezhao League, Inner Mongolia Province, China.

Horizon: Jiufutang Formation.


Age: ?Valanginian Stage, Middle Neocomian Subepoch, Lower Early Cretaceous Epoch, Early Cretaceous.

Material: A fragmentary skeleton including the crushed skull with lower jaw.

Breakdown as follows.

IVPP V11477-1: Skull and lower jaw.

IVPP V11477-2: Doral vertebrae with ribs and abdominal ribs.

IVPP V11447-3: Isolated vertebrae and 1 complete right ilium.

IVPP V11447-4, 5: Femora.

IVPP 11477-6: Complete left radius

And parts of other bones.


Species: pijiagouensis LIU, 2004
Etymology: In reference to Pijiagou, Liaoning Province, China, the name of the fossil locality.

Holotype: IVPP 13283

Locality: Pijiagou, Yixian, Liaoning Province, China.

Horizon: Jiufotang Formation.


Age: Aptian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material: An articulated and nearly complete skeleton with skull and lower jaws.