Saurolophinae

[5] In 2021, Madzia et al. registered Brachylophosaurini in the PhyloCode and formally defined it as "The largest clade containing Brachylophosaurus canadensis but not Edmontosaurus regalis, Hadrosaurus foulkii, Kritosaurus navajovius and Saurolophus osborni".

[citation needed] In 1989, Michael Brett-Surman proposed the name Kritosaurini as a tribe of hadrosaurines that contained Aralosaurus, Brachylophosaurus, Hadrosaurus, and Kritosaurus (including Gryposaurus).

[7] It was not until 2014 that Albert Prieto-Márquez officially defined and diagnosed Kritosaurini as the most exclusive clade of hadrosaurids containing Kritosaurus navajovius, Gryposaurus notabilis, and Naashoibitosaurus ostromi.

[8] Madia et al. (2021) defined the term under PhyloCode as "the largest clade containing Kritosaurus navajovius but not Brachylophosaurus canadensis, Edmontosaurus regalis, Hadrosaurus foulkii, Saurolophus osborni.

[4] Alarcón-Muñoz et al. (2023) suggested that austrokritosaurs shared an ancestor with the North American kritosaurins in the Santonian, about 85 million years ago, before dispersing into South America.

Likely dispersal route of the Austrokritosauria from North America to South America (red arrow)