Fig 1.
Locality and horizon of UFSM 11505.
Map of the Brazilian region showing the Faixa Nova–Cerrito I Outcrop (arrow) in the Santa Maria Formation (modified from Desojo et al. [22]) and chronostratigraphic diagram for the Triassic of southern Brazil (modified from Da-Rosa [47]). Ages according to Cohen et al. [36], and sequence stratigraphy according to Horn et al. [45].
Fig 2.
Skull of referred specimen of Aetosauroides scagliai (UFSM 11505), right lateral view.
Abbreviations: a, angular; aof, antorbital fenestra; d, dentary; en, external naris; f, frontal; l, lacrimal; ma, maxilla; maf, mandibular fenestra; n, nasal; of, orbital fenestra; p, parietal; pf, postfrontal; pm-pr, dorsal projection of premaxilla; pmx, premaxilla; prf, prefrontal; q, quadrate; sa, surangular; sa-pr, dorsal tuber of surangular; sp, splenial.
Fig 3.
Skull of referred specimen of Aetosauroides scagliai (UFSM 11505), left lateral view.
Abbreviations: same as Fig 2.
Fig 4.
Skull of referred specimen of Aetosauroides scagliai (UFSM 11505), dorsal view.
Abbreviations: same as Fig 2.
Table 1.
Maximum measurements (in mm) of the individual elements, fenestrae and fossae of the skull of UFSM 11505.
Asterisk: incomplete; dash: not preserved.
Fig 5.
Right quadrate in dorsal-lateral view.
Abbreviations: qb, quadrate body; qjc, quadratejugal contact; vc, ventral condyle; ac, anterior condyle; qr, quadrate ridge.
Fig 6.
Teeth of referred specimen of Aetosauroides scagliai (UFSM 11505).
(A-B) First two preserved teeth of the left maxilla. (C-D) Isolated dentary tooth. (E-F) Last three preserved teeth of the left maxilla. Arrows indicate serrations. Abbreviations: as Fig 2.
Fig 7.
Skull reconstructions of some aetosaur species and, in detail, the referred snout in dorsal view of each species.
(A) Aetosaurus ferratus (modified from Schoch [58]). (B) Paratypothorax andressorum (modified from Schoch & Desojo [32]). (C) Stagonolepis robertsoni (modified from Walker [7]). (D) Desmatosuchus smalli (modified from Small [42]). (E) Aetosauroides scagliai (modified from Desojo & Ezcurra [24]). Dotted lines represent unpreserved bones. Abbreviations: a, angular; aof, antorbital fenestra; ar, articular; d, dentary; f, frontal; j, jugal; l, lacrimal; m, maxilla; maf, mandibular fenestra; n, nasal; p, parietal; pf, postfrontal; pmx, premaxilla; pm-pr, dorsal projection of premaxilla; po, postorbital; prf, prefrontal; q, quadrate; qj, quadratojugal; sp, splenial; sq, squamosal.
Fig 8.
Strict (= Nelsen) consensus of 34 (A) and 6 (B) MPTs. (A) Strict consensus of the 34 MPTs with large polytomy. (B) Strict consensus of the 6 MPTs after a priori pruning of Aetobarbakinoides brasiliensis, Stenomyti huangae and Polesinesuchus aurelioi.
Fig 9.
Strict (= Nelsen) consensus of the 6 MPTs used for this study after a posteriori pruning of Coahomasuchus kahleorum.
Bremer support values are shown for all nodes.