The first member of the group discovered and named was Kritosaurus; it was named by paleontologistBarnum Brown in 1910.[2] Four years later, Canadian paleontologist Lawrence Lambe would name Gryposaurus.[3] The similarity between the two taxa was immediately recognized, and throughout the twentieth century the validity of the latter genus was doubted, with it being suggested both species were the same.[4][5] Only in the 1990s were they definitively identified as distinct.[6] Around this time, related hadrosaurs Naashoibitosaurus[7] and Secernosaurus[8] were discovered, and the modern interpretation of the group started to develop.[9]
In 2022, Rozadilla et al. described Huallasaurus and Kelumapusaura, two new genera similar to kritosaurins. In their study, they analyzed the relationships of the Kritosaurini and Hadrosauridae as a whole.[11] In a study the following year, Alarcón-Muñoz et al. implemented an updated version of the phylogenetic matrix of Rozadilla et al, proposing the name Austrokritosauria for the clade of entirely South American saurolophines closely related to kritosaurins. The results of their phylogenetic analyses of Saurolophinae are displayed in the cladogram below.[12]
^Lambe, Lawrence M. (1914). "On Gryposaurus notabilis, a new genus and species of trachodont dinosaur from the Belly River Formation of Alberta, with a description of the skull of Chasmosaurus belli". The Ottawa Naturalist. 27 (11): 145–155.
^Gilmore, Charles W. (1916). "Contributions to the geology and paleontology of San Juan County, New Mexico. 2. Vertebrate faunas of the Ojo Alamo, Kirtland and Fruitland Formations". United States Geological Survey Professional Paper. 98-Q: 279–302.
^Weishampel, David B.; Horner, Jack R. (1990). "Hadrosauridae". In Weishampel, David B.; Dodson, Peter; Osmólska Halszka (eds.). The Dinosauria (1st ed.). Berkeley: University of California Press. pp. 534–561. ISBN978-0-520-06727-1.
^Hunt, Adrian P.; Lucas, Spencer G. (1993). "Cretaceous vertebrates of New Mexico". In Lucas, S.G.; Zidek, J. (eds.). Dinosaurs of New Mexico. New Mexico Museum of Natural History and Science Bulletin, 2. Albuquerque, New Mexico: New Mexico Museum of Natural History and Science. pp. 77–91.
^ abBrett-Surman, Michael Keith. (1989). "A revision of the Hadrosauridae (Reptilia: Ornithischia) and their evolution during the Campanian and Maastrichtian". Faculty of the Graduate School of Arts and Sciences of the George Washington University.
^Prieto-Márquez, A. (2014). "Skeletal morphology of Kritosaurus navajovius (Dinosauria: Hadrosauridae) from the Late Cretaceous of the North American south-west, with an evaluation of the phylogenetic systematics and biogeography of Kritosaurini". Journal of Systematic Palaeontology. 12 (2): 133–175. doi:10.1080/14772019.2013.770417. S2CID84942579.
