APPENDIX 1 in Histovariability and lifestyle in Proterochampsidae Romer, 1966 (Archosauriformes) from the Chañares Formation (Late Triassic), northwestern Argentina

APPENDIX 1. — Inferred lifestyle obtained by the discriminant function A based on Rmin, S, Rmax, MC, Min, OC and SVL (model created by Laurin et al. (2004) for lissamphibians). This model was produced by forward selection of variables.Previously performed in amniotes femur by Quémeneur et al. (2013) and in ophiacodontids femur by Laurin & Buffrénil (2016). Possible states of lifestyle: 0 = aquatic; 1 = amphibious; 2 = terrestrial. Abbreviations: MC, modelled compactness; Min, minimun global value; OC, observed compactness; Rmax, maximun angular value; Rmin, minumum angular value; S, slope (global value); SVL, snout-vent length (cm).
Examples (from the literature)Tropidosuchus romeri Arcucci, 1990 PVL 4604 femur (this study)Clepsydrops Cope, 1875 (Pelycosauria: Ophiacodontidae) (Laurin & Buffrénil 2016)Coleonyx elegans Gray, 1845 (Squamata: Eublepharidae) (Quémeneur et al. 2013Gallotia stehlini (Schenkel, 1901) (Squamata: Lacertidae)) (Quémeneur et al. 2013)0 Aquatic1 Amphibious2 TerrestrialRmin0.0000.0000.0000.0003841.745–245.782–174.785S0.0260.0120.0150.016–54.535161.282100.756Rmax0.8581.0001.0001.0007.28443.31139.007MC0.2810.4340.3840.4086.79638.46524.597Min0.0000.007–0.002–0.001–540.124–26.355–58.849OC0.4620.4340.3720.48717.891–13.026–3.251SVL24.4033.357.0022.000.0600.0100.011Constante–––––272.307–37.327–26.839Inferred lifestyle0 Terrestrial2 Terrestrial2 Terrestrial2 Terrestrial–255.8289.04414.925 false