*Edit: After posting this, I learned both Andrea Cau (here) and Brad McFeeters (on Facebook) independently came to the same conclusion. Guess it really was an obvious synonymy. ;)
I'm skeptical that these and Deltadromeus belong in Tetanurae, as it only takes 4 steps to move them to Ceratosauria in Apesteguia et al.'s version of Carrano's tetanurine analysis, and Deltadromeus wasn't added to their version of Novas' tetanurine analysis which also lacks any ceratosaurs except the outgroup Ceratosaurus. They note "Gualicho does exhibit some apparent ceratosaurian synapomorphies, most notably a robust MT III with posteriorly expanded proximal articulation and a flange-like m. iliofibularis tubercle." It would have been interesting to run them in a ceratosaur analysis.
|Holotypes of Gualicho shinyae (MPCN PV 0001; top) and Aoniraptor libertatum (MPCA-Pv 804; bottom) in posterior (E), anterior (F), left lateral (G) and dorsal (H) views. Modified from Apesteguia et al. (2016) and Motta et al. (2016).|
References- Apesteguía, Smith, Juárez Valieri and Makovicky, 2016. An unusual new theropod with a didactyl manus from the Upper Cretaceous of Patagonia, Argentina. PLoS ONE. 11(7), e0157793.
Motta, Aranciaga Rolando, Rozadilla, Agnolin, Chimento, Brisson Egli and Novas, 2016. New theropod fauna from the Upper Cretaceous (Huincul Formtation) of northwestern Patagonia, Argentina. In Khosla and Lucas (eds.). Cretaceous period: Biotic diversity and biogeography. New Mexico Museum of Natural History and Science Bulletin. 71, 231-253.