|Strict consensus tree of Ezcurra's (2010) analysis, after Figure 15A in that paper.|
EDIT: I have now received the actual NEXUS file with proper codings for all 378 characters which finds trees 1186 steps long as in Ezcurra's paper, and the results differ slightly. Those who read this in the first hour of its posting saw incorrect numbers below, though the conclusions remain the same.
So let's examine how other topologies fare, going from most plausible to least.
Placing Guaibasaurus closer to Neotheropoda than Saturnalia, sauropodomorphs, herrerasaurids and Eoraptor (as in other published analyses) is only four steps longer. Panphagia and Chromogisaurus remain in a clade with Saturnalia at the base of Sauropodomorpha, while Agnosphitys could go in any eusaurischian position outside Saturnaliinae and Pantydraco + other sauropodomorphs. Thus another aspect of Guaibasauridae is poorly supported.
Placing Agnosphitys in Theropoda (as in Yates' analyses) is four steps longer.
What conclusions can we draw from this study?