Genus: Palaeotrionyx KUSNESTEZOV & CKHIKUADZE, 1987
Etymology: Latin, paleo, "ancient" + Trinoyx.

Species: riabinini KUSNESTEZOV & CKHIKUADZE, 1987
Etymology:
= Trionyx riabinini KUSNESTEZOV & CKHIKUADZE, 1987
= ?Axestemys riabinini KORDIKOVA, 1991
= Axestemys (Axestemys) riabinini KORDIKOV, 1994
= Khunnuchelys riabinini CHIKHIKVADZE, 2000
= Eurycephalochelys riabinini CHKHIKVADZE, 2007

Holotype: IZK R- 3920

Locality: Shakh-Shakh, Kazakhstan.

Horizon: Bostobe Formation.

Biostratigraphy:

Age: Santonian-Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Fragment of shell.

Referred material:

No. 3815:

No. 3927:

No. 3963:

No. 3971:

No 3921:

Fragment of shell.