Species: tlayuaensis REYNOSO, 1997
Etymology: From tlayua (= place of darkness), Nahuatl. In reference to the name in the quarry where the skeleton was found.
Holotype: IGM 6854
Locality: Tlayua Quarry, Locality No. 2432 Cantera Tlayua-IGM, level Z/X, 2 km southeast of the Colonia Morelos, near Tepexi de Rodriguez, Puebla State, Mexico.
Horizon: Middle member, Tlayua Formation.
Age: Middle or Late Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.
Material: A severely crushed skeleton of a juvenile sphenodontian preserved
in part and counterpart blocks. The skull is poorly preserved and most of the
anterior limb elements lacking.
Note: Skin impressions from several different places on the skeleton.