Triassic faunal successions of the Paraná Basin, southern Brazil

New record of Prozostrodon brasiliensis (Eucynodontia: Prozostrodontia) from its type-locality (Upper Triassic, Southern Brazil): comments on the endocranial morphology

“…Numerical ages from Triassic strata of Brazil are indicated by stars and are based onLanger et al (2018) andPhilipp et al (2018). Sequence stratigraphy and biostratigraphy are based onHorn et al (2014) andSchultz et al (2020). B-C, Geological chart and location of Faixa Nova locality(Da- Rosa, 2004;Da-Rosa & Faccini, 2005;CPRM, 2006;Horn et al, 2014).…”

Skull osteology of Aetosauroides scagliai Casamiquela, 1960 (Archosauria: Aetosauria) from the Late Triassic of Brazil: New insights into the paleobiology of aetosaurs

“…The specimen reported here, MCN-PV 2347 (Figure 1D), was recovered from the mudstone layers of the Piche Site (the same as Outcrop 1 of Perez and Malabarba, 2002) on the fringes of São João do Polêsine city (Figure 1B, C and E). The faunal composition of the Piche Site supports its correlation with other outcrops of the HAZ (Langer et al, 2007;Desojo et al, 2012;Roberto da Silva et al, 2013;Jenisch et al, 2017;Garcia et al, 2019;Schultz et al, 2020).…”

“…Furthermore, we provide considerations regarding feeding strategies in A. scagliai, based on its dental pattern and assorted rostral and mandibular characters, The vertebrate record of the Upper Triassic of South America has yielded a remarkably rich terrestrial faunal content, providing an important window into the early evolutionary history of the major archosaurian lineages (Langer et al, 2007;Martinez et al, 2012;Cabreira et al, 2016;Pretto et al, 2018;Müller et al, 2018;Ezcurra et al, 2017;Mastrantonio et al, 2019;Desojo et al, 2020a;Schultz et al, 2020). In Brazil, aetosaurs come from outcrops located in the state of Rio Grande do Sul (Figure 1A), assigned by sequence stratigraphy to the base of the Candelária Sequence, Santa Maria Supersequence (sensu Horn et al, 2014), and by biostratigraphy to the Hyperodapedon Assemblage Zone (HAZ; e.g., Lucas and Heckert, 2001;Langer et al, 2007;Leal and Da-Rosa, 2009;Schultz et al, 2020). Brazilian specimens of Aetosauroides scagliai have been recovered from three HAZ outcrops named Inhamandá, Faixa Nova, and Buriol, whose layers are composed of laminated reddish mudstones, fine massive sandstones, or stratified sandstones with ripple marks representing sheet deltas and ephemeral lakes (Horn et al, 2014;Schultz et al, 2020).…”

“…In Brazil, aetosaurs come from outcrops located in the state of Rio Grande do Sul (Figure 1A), assigned by sequence stratigraphy to the base of the Candelária Sequence, Santa Maria Supersequence (sensu Horn et al, 2014), and by biostratigraphy to the Hyperodapedon Assemblage Zone (HAZ; e.g., Lucas and Heckert, 2001;Langer et al, 2007;Leal and Da-Rosa, 2009;Schultz et al, 2020). Brazilian specimens of Aetosauroides scagliai have been recovered from three HAZ outcrops named Inhamandá, Faixa Nova, and Buriol, whose layers are composed of laminated reddish mudstones, fine massive sandstones, or stratified sandstones with ripple marks representing sheet deltas and ephemeral lakes (Horn et al, 2014;Schultz et al, 2020). The specimen reported here, MCN-PV 2347 (Figure 1D), was recovered from the mudstone layers of the Piche Site (the same as Outcrop 1 of Perez and Malabarba, 2002) on the fringes of São João do Polêsine city (Figure 1B, C and E).…”

“…A few additional specimens are known from the younger strata of the Exaeretodon Biozone (Martinez et al, 2012). The SEHB and the HAZ are considered biostratigraphically equivalent based on their common faunal elements (e.g., Langer et al, 2007;Martinez et al, 2012;Langer et al, 2018Desojo et al, 2020bSchultz et al, 2020) and have been confirmed at ages around 229.25 and 233.23 Ma through radioisotopic dating (e.g., Martinez et al, 2012;Langer et al, 2018;Desojo et al, 2020b).…”