Tchoiria

Tchoiria () is a genus of neochoristoderan reptile from the Early Cretaceous of Mongolia. The name Tchoiria comes from the city of Choir which is nearby to where the holotype was found. 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.

== History of research == left|thumb|Ikechosaurus, formerly T. egloni 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. He would make the type species T. namsari. Efimov would name two other Tchoiria species in the latter 20th century, T. magnus in 1979 and T. egloni in 1983. Both taxa were based on postcranial fossils that were also found in the Hühteeg Formation. These would later be redescribed as new members of Neochoristodera by Efimov. The second valid species of Tchoiria would be named in 2005 by Danial T. Ksepka. T. klauseni would be based on a partial skull and some postcranial material found at the Two Volcanoes locality of southern Mongolia. Efimov would place Tchoiria in the order Choristodera in his original description. Later it would also be placed in suborder Neochoristodera in 2007 by Ryoko Matsumoto. Matsumoto would declare the suborder monophyletic in her paper on the choristodere Monjurosuchus. 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.