José Bonaparte and colleagues, in a 2007 study, found "Saturnalia" to be very similar to the primitive saurischian "Guaibasaurus". Bonaparte placed the two in the same family, Guaibasauridae. Like Langer, Bonaparte found that these forms may have been primitive sauropodomorphs, or an assemblage of forms close to the common ancestor of the sauropodomorphs and theropods. Overall, Bonaparte found that both "Saturnalia" and "Guaibasaurus" were more theropod-like than prosauropod-like. However, all more recent cladistic analyses found it to be a very basal sauropodomorph,