Temporal range: Late Triassic, 228–215 Ma
Malerisaurus was a medium-sized prolacertiform which averaged 1.2 meters in length. Malerisaurus is known from the holotype ISIR 150, two articulated and almost complete skeletons which were discovered as the presumable gastric contents of two skeletons of Parasuchus hislopi. It was collected from the Lower Maleri Formation, dating to the late Carnian or early Norian stage of the Late Triassic. Malerisaurus robinsonae was a small archosauromorph, probably capable of climbing trees and swimming. The skull has some adaptations to a carnivorous diet, but is nevertheless unspecialised and probably more of an insectivore. Malerisaurus, seen as a diapsid skull, shows primitive and advanced facies in its unossified laterosphenoid, absence of antorbital and mandibular fenestrae, gracile form, primitive girdles, elongated cervicals and absence of dermal armour. The suborder Prolacertiformes currently represents four families: Sharovipterygidae, Protorosauridae, Prolacertidae and Tanystropheidae. Chatterjee provisionally regarded Malerisaurus as close to Protorosaurus.
A second species, M. langstoni, is known from the holotype TMM 31099-11, a partial but poorly preserved skeleton. It was collected in the Otis Chalk Quarry 2 (TMM 31099 locality) from the Colorado City Formation, Chinle Group, dating to the early Carnian stage of the Late Triassic, about 228-227.5 million years ago. It was found in the Howard County of Texas. Spielmann et al. (2006) redescribed the type material of M. langstoni and concluded that it's indistinguishable from the type species of Trilophosaurus, T. buettneri, and thus M. langstoni represents its junior synonym.
Malerisaurus was named by Sankar Chatterjee in 1980 and the type species is Malerisaurus robinsonae. A second species, M. langstoni, was named by him in 1986. The generic name is derived from the name of the Lower Maleri Formation, where the holotype of the type species was collected, and sauros, Greek for "lizard". The specific name of M. langstoni honors the American paleontologist and professor Wann Langston, Jr..
- Sankar Chatterjee (1980). "Malerisaurus, A New Eosuchian Reptile from the Late Triassic of India". Philosophical Transactions of the Royal Society of London, Series B. 291: 163–200. doi:10.1098/rstb.1980.0131.
- Sankar Chatterjee (1986). "Malerisaurus langstoni, a new diapsid reptile from the Triassic of Texas". Journal of Vertebrate Paleontology. 6 (4): 297–312. doi:10.1080/02724634.1986.10011627.
- Spielmann, J.A., Lucas, S.G., Hunt, A.P., and Heckert. 2006. Reinterpretation of the holotype of Malerisaurus langstoni, a diapsid reptile from the Upper Triassic Chinle Group of West Texas. The Triassic-Jurassic Terrestrial Transition. New Mexico Museum of Natural History and Science, Bulletin 37:543-547.