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TABLE 1. List of comparative taxa used in this study. Type-materials are indicated in bold.

Taxa Primary Reference Specimens studied in
first-hand by V.D.P.N.
Aetobarbakinoides brasiliensis Desojo et al., 2012. CPEZ-168.
Aetosauroides scagliai Casamiquela, 1960; 1961; 1967; Desojo, 2005; Desojo and Ezcurra, 2011; Brust et al., 2018. PVL 2052; PVL 2059; MCN-PV 2347; MCP-3450-PV; UFSM 11505.
cf. Aetosauroides scagliai Desojo, 2005; Parker, 2016a. PVSJ 326.
Aetosaurus ferratus Walker, 1961; Schoch, 2007. SMNS 5770, mainly S-16, S-18 and S-21; SMNS 18554.
cf. Aetosaurus ferratus Jenkins et al., 1994. MCZ 9479R cast of MCZ 22/92G.
Acaenasuchus geoffroyi Marsh et al., 2020.  
Archaeopelta arborensis Desojo et al., 2011. CPEZ-239a
Caiman latirostris - UFRGS-PV-002-Z.
Calyptosuchus wellesi Long and Murry, 1995; Parker, 2018. UMMP 13950. Putative materials are UCMP 27409, UCMP 27414, UCMP 78695 and UCMP 195192.
Coahomasuchus chathamensis Heckert et al., 2017; Hoffman et al., 2018, 2019. NCSM 23618.
Coahomasuchus kahleorum Heckert and Lucas, 1999; Desojo and Heckert, 2004. NMMNH P-18496.
Desmatosuchus smalli Small, 2002; Parker, 2005. TTU-P 9023; TTU-P 9024; TTU-P 9025; TTU-P 9420;
Desmatosuchus spurensis Case, 1922; Long and Murry, 1995; Parker, 2005; Parker, 2008; Parker, 2018. GPIT-PV-108053; UCMP 25877; UCMP 27988; UCMP 34490*; UMMP 3396*; UMMP V7476 and MNA V 9300.
Diandongosuchus fuyuanensis Stocker et al., 2017.  
Dyoplax arenaceus Maisch et al., 2013. SMNS 4760
Dromicosuchus grallator Sues et al., 2003. NCSM 13733 (previous UCN 15574).
Effigia okeeffeae Nesbitt, 2007. AMNH 30587.
Erpetosuchus granti Benton and Walker 2002. -
Erpetosuchus sp. Olsen et al., 2001. AMNH FR 29300.
Hesperosuchus gracilis Nesbitt, 2011. AMNH FR 6758.
Gracilisuchus stipanicicorum Romer, 1972; Lecuona, 2013; Butler et al., 2014. PULR 08, MCZ 4116 and MCZ 4117.
Longosuchus meadei Sawin, 1947; Witmer, 1997; Nesbitt, 2011. TMM 31185-97; TMM 31185-98.
Lucasuchus hunti Parker, 2016a. TMM 31100-531*, TMM 31100-1 and TMM 31100-313.
Mandasuchus tanyauchen Butler et al., 2017. -
Neoaetosauroides engaeus Bonaparte, 1969; Desojo, 2005; Desojo and Báez, 2007. PVL 3525 and PULR 5698.
Ornithosuchus woodwardi Walker, 1964; von Baczko and Ezcurra, 2016. -
Pagosvenator candelariensis Lacerda et al., 2018. MMACR PV 036-T
Paratypothorax andressorum Schoch and Desojo, 2016. SMNS 19003.
Paratypothorax sp. Long and Ballew, 1985; Parker, 2016a. PEFO 3004 and TTU-P09416.
Parringtonia gracilis Nesbitt and Butler, 2013; Nesbitt et al., 2018. -
Polesinesuchus aurelioi Roberto-da-Silva et al., 2013 ULBRAPV003T.
Prestosuchus chiniquensis Mastrantonio et al., 2013; Mastrantonio et al., 2019. UFRGS-PV-0629-T.
Revueltosaurus callenderi Parker et al., 2005; Nesbitt, 2011. -
Riojasuchus tenuisceps von Baczko et al. 2016. PVL 3827 (by J.B.D.).
Scutarx deltatylus Parker, 2016b. PEFO 34616.
Stagonolepis robertsoni Walker, 1961; Witmer, 1997; Gower and Walker, 2002. ELGNM 38; MCZD 2; and several NSM casts, including R 4790 and R 4787.
Stagonolepis olenkae Sulej, 2010. ZPAL AbIII/466/17; ZPAL AbIII/1996 and ZPAL AbIII/1997; ZPAL AbIII/2000; ZPAL AbIII/2376; ZPAL AbIII/2722; and ZPAL AbIII 50124.
Stenomyti huangae Small and Martz, 2013. DMNH 34565; DMNH 60708; DMNH 61392. Putative specimens are DMNH 55070 and DMNH 45882.
Stegomus arcuatus Lucas et al., 1998. YPM [PU] 21759; YPM-PU 21750.
Tarjadia ruthae Arcucci and Marscicano, 1998; Ezcurra et al. 2017. PULR 63.
Typothorax coccinarum Martz, 2002; Heckert and Lucas, 2010; Reyes et al. 2021. TTU-P09214; YPM PV 058121.

 

 

 

TABLE 2. Comparative measurements of Aetosauroides scagliai skulls, in mm.

  MCN-PV 2347 UFSM 11505 PVL 2059
Skull total height (from jugal to parietal) 46.5 - -
External nares height 10.4 11 11
External nares length - 39.8 ~50
Antorbital fenestra length 29.6 32.9 -
Antorbital fenestra height ~07.2 12 -
Antorbital fossa length 36.6 45.8 -
Antorbital fossa height 24.5 25.5 -
Orbit height 24.8 33 -
Orbit length 27.7 28.8 -
Infratemporal fenestra length 5.3 - -
Infratemporal fenestra height 10.7 - -
Supratemporal fenestra length ~20 - -
Supratemporal fenestra height 22.3 - -

 

 

 

TABLE 3. Measurements of the skull of Aetosauroides scagliai specimen MCN-PV 2347, in mm.

Premaxilla height ~4.5
Maxilla length ~70.8*
Maxilla height ~25.7*
Nasal maximum width 12.7
Nasal length (preserved) 63.1
Prefrontal length 19.5
Prefrontal height -
Lacrimal length ~30.0
Lacrimal height 18.5
Frontal length ~30
Frontal width 14.2
Postfrontal length ~8.7
Parietal length 18.7
Parietal width 2.22
Jugal length 42.1
Jugal height 10.0
Quadratojugal ventral length 16.6
Quadratojugal height 16.1
Squamosal dorsal length 16.0
Squamosal maximum height ~31.1

 

 

 

 

TABLE 4. Comparative measurements of the quadrate of Aetosauroides scagliai specimens MCN-PV 2347 (left element) and MCP-3450-PV.

  MCN-PV 2347 MCP-3450-PV left
Height 37.5 -
Condyle width ~13.2 13.0
Condyle length 7.0 6.2

 

 

 

TABLE 5. Measurements of the mandible of Aetosauroides scagliai specimen MCN-PV 2347, in mm.

Dentary height at mid length 31.4
Mandibular fenestra height 12.4
Mandibular fenestra length 37.1
Retroarticular process from posterior
border of mandibular fenestra
31.1
Surangular maximum height 12.7
Surangular maximum length ~64.6

 

TABLE 6. Measurements of the teeth of Aetosauroides scagliai (MCN-PV 2347 and UFSM 11505). 

Specimen Position Crown height (CH) Crown length (CL) CH/CL
(%)
Crown width Crown base length
UFSM 11505 MX3L 4.9 3.1 63.3% - 2.7
UFSM 11505 MX6L 4.4 2.9 65.9% - 3.3
UFSM 11505 MX8L 4.6 3.2 69.6% - 3.0
UFSM 11505 PMX4R 2.3 1.6 69.6% - 1.7
UFSM 11505 D?L 4.9 2.1 42.9% - 2.4
MCN-PV 2347 PMX1L 2.8 1.5 53.6% 1.4 1.6
MCN-PV 2347 PMX3L 3.5 2.1 60.0% 1.1 2.1
MCN-PV 2347 D10R 3.9 2.3 59.0% - -

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