Table 1. Sources of comparative data used in this study.

Taxon	Source(s)
Adeopapposaurus mognai	Martínez [21]; PVSJ 568, 569, 610
Anchisaurus polyzelus	Yates [42]; Fedak and Galton [53]
Coloradisaurus brevis	Bonaparte [15]; PVL 3967, 5904
Efraasia minor	Galton [54]; Yates [55]
Eoraptor lunensis	Sereno et al. [10]; Martinez et al. [11]; PVSJ 512
Glacialisaurus hammeri	Smith and Pol [45]
Herrerasaurus ischigulastensis	Sereno and Novas [56]; PVSJ 407
Ignavusaurus rachelis	Knoll [48]
Jingshanosaurus xinwaensis	Zhang and Yang [57]
Lessemsaurus sauropoides	Bonaparte [16]; Pol and Powell [17]
Lufengosaurus huenei	Young [58], [59]; Barret et al. [60]
Massospondylus carinatus	Cooper [44]: Attridge et al. [52], Sues et al. [61]
Melanorosaurus readi	Yates [34]
Mussaurus patagonicus	Pol and Powell [19]
Panphagia protos	Martinez and Alcober [12]; PVSJ 874
Pantydraco caducus	Yates [62]
Plateosaurus engelhardti	Galton [63], [64]; Moser [65]
Riojasaurus incertus	Bonaparte [13]; Bonaparte and Pumares [14]; PVL3803, PVSJ 849 (skull)
Sanjuansaurus gordilloi	Alcober and Martínez [66]; PVSJ 605
Sarahsaurus aurifontanalis	Rowe et al. [49]
Saturnalia tupiniquim	Langer [5]; Langer et al.[4]
Seitaad ruessi	Sertich and Loewen [47]
Thecodontosaurus antiquus	Benton et al [67]
Unaysaurus tolentinoi	Leal et al. [9]
Yimenosaurus youngi	Bai et al. [68]
Yunnanosaurus huangi	Young [69]; Barret et al. [70]
Yunnanosaurus youngi	Lu et al.[71]

All specimens compared in the text were observed from their respective source listed in this table. Comparisons based on other specimens, or taken from additional references, are explicitly indicated in the text.