Tchoiria

 
Tchoiria is a genus of simoedosaurid choristodere, a type of crocodile-like aquatic reptile. Fossils of this genus have been found in Early Cretaceous-age rocks in Mongolia. Four species have been named, but two have been given their own genera. The type species is "T. namsari", based on PIN 3386/1, a partial skull and skeleton discovered in the Aptian-age Lower Cretaceous Hühteeg Formation at Hüren Dukh, central Mongolia. Two other species were named from this locality, with both later being reassigned: "T. egloni", now "Irenosaurus egloni"; and "T. magnus", now "Ikechosaurus magnus". A fourth species, "T. klauseni", was named from a partial skull and skeleton found in rocks of roughly the same age farther west in Mongolia.