Species: paradoxus WANG, 2000
Etymology: Greek, paradoxus, "contrary to expectation."

Holotype: IVPP V 11944A, B (part and counterpart.)

Locality: Daohugou Locality, Inner Mongolia (Nei Mongol), China.

Horizon: Daohugou bed, Horizon 1, Yixian Formation, Jehol Group.

Biostratigraphy: Psittacosaurus Fauna, Confuciusornis Avifauna.

Age: Valanginian Stage, Upper Neocomian Subepoch, Early Early Cretaceous Epoch, Early Cretaceous.

Material: Nearly complete skeleton.

Note: Skin impressions.

Paratypes:

IVPP V 11943 A, B, V 11946, V 11984A: Fragmentary skeletons.

Note: Skin impressions.

Referred material:

IVPP V 11970: Impression of an incomplete skeleton.

CARROLL & ZHENG, 2012

0009B: Skull of an adult.

0039B: Skull of a neotenic salamander.

DFONG, HUANG, & WANG, 2011, 2012

IVPP V14195, V18083: Nearly complete specimens.

Note With conchostracans or insects as stomach contents.

Note: With soft tissue impressions (e.g. eyes, gills, skin, tail fins).