Genus: Biseridens LI & CHENG, 1997
Etymology: Latin, Biseri, “double rows”, Latin, dens, word derived from Greek “odons”, “Teeth”.

Species: qilianicus LI & CHENG, 1997
Etymology: qilian, anme of the mountain, on which the fossil was discovered.

Holotype: IGCAGS V 632

Locality: Dashankou Locality, Yumen, Gansu (Kansu) Province, China.

Horizon: Xidagou Formaiton.

Biostratigraphy: Biseridens Assemblage.

Age: Middle Permian.

Material: An incomplete skull with posterior portion of left ramus of lower jaw.

Paratype: IVPP V 12009: Anterior part of lower jaws with complete dentition.

Referred material:


IVPP V 16013: Almost complete skull wiht lower jaws, missing posterior portions and articulated series of 14 vertebrae.