Amniota - Therapsida - Lystrosauridae

Synonyms: Dicynodon (Ptychognathus) latirostris Owen 1859, Ptychognathus alfredi Owen 1862, Ptychognathus depressus Owen 1876

Full reference: R. Broom. 1932. The mammal-like reptiles of South Africa and the Origin of Mammals

Belongs to Lystrosaurus according to R. Broom 1932

Sister taxa: Lystrosaurus amphibius, Lystrosaurus bothai, Lystrosaurus breyeri, Lystrosaurus broomi, Lystrosaurus curvatus, Lystrosaurus georgi, Lystrosaurus hedini, Lystrosaurus jeppei, Lystrosaurus jorisseni, Lystrosaurus mccaigi, Lystrosaurus murrayi, Lystrosaurus oviceps, Lystrosaurus platyceps, Lystrosaurus primitivus, Lystrosaurus putterilli, Lystrosaurus robustus, Lystrosaurus rubidgei, Lystrosaurus shichanggouensis, Lystrosaurus theileri, Lystrosaurus wageri, Lystrosaurus wagneri, Lystrosaurus youngi, Ptychosagium murrayi, Ptychosagium declivis

Ecology: herbivore