[1] Tchoiria is thought to have a similar diet to another neochoristoderan reptile, Champsosaurus, due to morphology of the skull.

It would hunt in freshwater environments, like the living gharials, where it would prey on many different types of fish and turtles.

[2][3] Tchoiria remains were first recovered as a part of the Joint Soviet-Mongolian Expeditions which took place in the Gobi Desert.

They were described by Mikhail B. Efimov in 1975; basing his description on a partial cranium and some parts of the postaxial skeleton found at the Hühteeg Formation.

T. klauseni would be based on a partial skull and some postcranial material found at the Two Volcanoes locality of southern Mongolia.

[7] Tchoiria was the first choristodere known from Asia and has been used in many morphological and environmental studies based on the order since its original description.

The skull of Tchoiria is similar to other neochoristoderes in having a flared postorbital region, an elongated and narrow snout, and having small orbits.

Other skull traits include a shortened lower jaw symphysis, a broader and shorter rostrum, and the posterior displacement of mandibular articulation.

Later in the Cretaceous and the early Paleocene, neochoristoderans needed to become more specialized because of their shared ecosystem with a wide range of crocodiles.

[11] This formation was first explored in the early 1970's as a part of the Joint Soviet-Mongolian expeditions and has been dated to Aptian in age by pollen and invertebrate fossils.

[12] The scant plant fossils found nearby shows the environment to be a staple of the Cretaceous; a temperate and plant-covered ecosystem.

The aquatic environment included but is not limited to mollusks, Ostracods, bony fish, turtles, some crocodiles, and Tchoiria itself.