Genus: Ordosyodon YOUNG, 1974
Etymology: In reference to the Ordos Desert, Inner Mongolia, China, where the fossil was found and + Syodon.
= Ordosia HOU, 1979 non LU, 1954 (Trilobita, Corynexochida)
Etymology: In reference to the Ordos Desert, Inner Mongolia, China, where the fossil was found.
= Ordosidon YOUNG, 1961
Etymology: In reference to the Ordos Desert, Inner Mongolia, China, where the fossil was found and Greek, odon, “tooth”: Ordos tooth.

Species: lincheyuensis (YOUNG, 1961) YOUNG, 1974
Etymology:
= Ordosidon lincheyuensis YOUNG, 1961

Holotype: IVPP V2483

Locality: Linzheyu, Baode, Shaanxi (Shensi) Province, China.

Horizon: Lower Ermaying Formation.

Biostratigraphy:

Age: Late Early Triassic.

Material: A fragmentary left jaw with 12 broken teeth or alveoli.
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Species: youngi (HOU, 1979)
Etymology: In honor of C. C. Young.
= Ordosia youngi HOU, 1979

Holotype: IVPP V 4786

Locality: Jungar Qi region, Yih Ju Meng, Inner Mongolia, China.

Horizon: Lower Er-Ma-Ying Formation.

Biostratigraphy:

Age: Late Early Triassic.

Material: Fragmentary skull, dentary and fragmentary skeleton.