The notarium meanwhile appears to have been more similar to the basal Juncitarsus than to other phoenicopterids. Agnolin proposes that M. peiranoi may have been one of the more basal species of Megapaloelodus.
The notarium shares a more ancestral lineage with the Juncitarsus compared to other phoenicopterids, as suggested by Agnolin. This suggests that M. peiranoi could be an early representative of the Megapaloelodus group.