... The Triassic outcrops of the Santa Maria Supersequence (Middle-Late Triassic) located in the central region of the Rio Grande do Sul State of southern Brazil have historically been the site of many important finds since they were first scientifically prospected in the late 1920s (Huene, 1935(Huene, -1942(Huene, , 1942Beltrão, 1965). Efforts to explore these and new localities have continued during subsequent decades (Barberena, 1977;Barberena et al., 1985;Schultz, Scherer & Barberena, 2000;Da-Rosa, 2014;Horn et al., 2014;Müller et al., 2014) and have produced an ample record for many groups of archosaurs and non-archosaurian archosauriforms, such as aetosaurs (Desojo, Ezcurra & Kischlat, 2012;, doswellids (Desojo, Ezcurra & Schultz, 2011), early branch loricatans (Barberena, 1978;França, Ferigolo & Langer, 2011;Lacerda, Schultz & Bertoni-Machado, 2015;Roberto-Da-Silva et al., 2014), rauisuchids (Huene, 1935(Huene, -1942Lautenschlager & Rauhut, 2014), poposaurids (França et al., 2014), phytosaurs (Kischlat & Lucas, 2003), proterochampsids (Bertoni-Machado & Kischlat, 2003;Raugust, Lacerda & Schultz, 2013), aphanosaurians , a possible pterosaurs (Bonaparte, Schultz & Soares, 2010;Dalla Vecchia, 2013) and several dinosauriforms (e.g. Colbert, 1970;Bonaparte, Ferigolo & Ribeiro, 1999;Langer et al., 1999;Leal et al., 2004; Figure 1. ...