Species: minor MIKHAILOV, 1996
Etymology: Latin, minor, "minor."

Holotype: PIN 3142-422

Locality: Hermiin Tsav (Khermeen Tsav), western Ömnögov (South Gobi), Mongolia.

Horizon: Barun Goyot Formation.

Biostratigraphy:

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

Material: Complete egg.

Referred material:

About 25 complete eggs and numerous egg fragments from Khermin-Tsav, Khulsan, Gilbent localities (PIN 3142-401, 3142-402, 3142-403, 3142-416, 3142-417, 3142-421, 3142-424, 3142-439, 3142-441, 3142-465, 3142-471, 3142-482, 3142-483, 3142-490, 3142-491, etc). Barungoit Formation in the Nemegt Basin.

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Species: maior MIKHAILOV, 1996
Etymology: Latin, maior, "large."

Holotype: PIN 4478-1

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: Complete egg.

Referred material:

About five complete eggs from localities Khulsan and Gilbent, (PIN 3142-460, 4478-2, 4478-6, 4478-7), Barungoit Formation, Nemegt Basin.