Genus: Tarchia MARYANSKA, 1977
Etymology: From Mongolian, tarchi, “brain” + ia: “Brainy one”.
= Tarcia [ANONYMOUS 1992]

Species: kielanae MARYANSKA, 1977
Etymology: In honor of Prof. Zofia Kielan-Jaworowska in recognition of her work on Mongolian vertebrates.

Holotype: ZPAL MgDI/111

Locality: Khulsan, Nemegt basin, Ömnögov (South Gobi), Mongolia.

Horizon: Barun Goyot Formation.

Biostratigraphy:

Age: Middle –Late Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Fragmentary skull with skull roof, occipital part and brain case.
Note: Paleopathology? Skull roof has a ‘D’-shaped hole possible from a Tarbosaurus (TUMANOVA, GALLAGHER, DODSON & AXLE, 1998)

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Species: teresae PENKALSKI & TUMANOVA, 2017
Etymology: In honor of Teresa Maryanska in recognition of her work on Asian dinosaurs.
= Tarchia giganteaTUMANOV, 1977 (referred material).

Holotype: PIN 3142/250

Locality: Nemget, Nemegt basin, Ömnögov (South Gobi), Mongolia.

Horizon: Nemegt Formation.

Biostratigraphy:

Age: Lower Maastrichtian Stage, Uppermost Senonian, Uppermost Gulf Epoch, Late Cretaceous.

Material: Skull, and dentary, cervical vertebrae, scapula, sacrum, ischia, femur, ribs and spines.