page_title: Riograndia
section_title: Paleoecology
hierarchical_section_title: Riograndia / Paleoecology
caption_attribution_description: Paleoartistic reconstruction of Brasilodon quadrangularis (left) and Riograndia guaibensis (right), two abundant probainognathian cynodonts from the Riograndia AZ of the Candelária Sequence, Santa Maria Supersequence (Brazil), which exhibits different morphologies in skull, dentition and locomotor apparatus.
context_page_description: Riograndia is an extinct genus of tritheledontid cynodonts from the Late Triassic of South America. The type and only species is Riograndia guaibensis. Remains have been found in the Caturrita Formation of the geopark of Paleorrota. It was a small non-mammalian cynodont several advanced features also present in mammals. Several specimens of Riograndia guaibensis have been found in the towns of Candelária and Faxinal do Soturno in the Caturrita Formation. The genus defines the Riograndia Assemblage Zone.
context_section_description: All specimens of Riograndia come from the Late Triassic aged Caturrita Formation. The formation dates to about 225 million years ago, and it based in the present-day country of Brasil. Dinosaurs from the formation only include the sauropodomorph Unaysaurus and the theropod Guaibasaurus. Non-dinosaurian animals include the dinosauriform Sacisaurus; the dicynodontid Jachaleria; an unnamed phytosaurian; isolated archosaurian teeth; an amphibian classified in Stereospondyli; and many common tetrapods smaller than 15 cm (5.9 in) long. Among the tetrapods is the procolophonid Soturnia; the sphenodontid Clevosaurus; the lepidosaurian Cargninia; the pterosaurian Faxinalipterus, and an assortment of mammaliamorphs including Riograndia, Brasilodon, Brasilitherium, Irajatherium, and Minicynodon.
caption: Restoration of Brasilodon and Riograndia
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