Name: Huallasaurus ‭(‬duck lizard‭)‬.
Phonetic: Hu-al-lah-sor-us.
Named By: Sebastián Rozadilla,‭ ‬Federico Brissón Egli,‭ ‬Federico Agnolin,‭ ‬Alexis Mauro Aranciaga-Rolando‭ & ‬Fernando Emilio Novas‭ ‬-‭ ‬2022.
Synonyms: Kritosaurus australis..
Classification: Chordata,‭ ‬Dinosauria,‭ ‬Ornithischia,‭ ‬Ornithopoda,‭ ‬Hadrosauridae,‭ ‬Saurolophinae,‭ ‬Kritosaurini.
Species: H.‭ ‬australis‭ (‬type‭)‬.
Diet: Herbivore.
Size: Uncertain.
Known locations: Argentina,‭ ‬Patagonia‭ ‬-‭ ‬Los Alamitos Formation‭‬.
Time period: Late Cretaceous.
Fossil representation: Partial remains.

       The naming history of this dinosaur is somewhat convoluted.‭ ‬The fossils that would go on to establish this genus were originally described‭ ‬in‭ ‬1984,‭ ‬but as a species of Kritosaurus,‭ ‬K.‭ ‬australis.‭ ‬As you may have inferred front‭ ‬the species name,‭ ‬it was thought that a southern population of Kritosaurus had been discovered,‭ ‬other fossils of the genus were only known from North America.‭ ‬However a new study in‭ ‬2010‭ (‬Prieto–Marquez‭ & ‬Salinas‭) ‬considered K.‭ ‬australis to actually represent a more fully‭ ‬grown form of Secernosaurus,‭ ‬an earlier named hadrosaurid dinosaur genus that had been based upon the remains of a dinosaur that was likely not fully grown.‭ ‬However by‭ ‬2015‭ ‬another study‭ (‬Coria‭) ‬noted several differences between the fossils of what were once K.‭ ‬australis and those of Secernosaurus.‭ ‬A later study in‭ ‬2022‭ (‬Rozadilla et al‭) ‬confirmed that not only were the K.‭ ‬australis fossils different from Secernosaurus,‭ ‬they were not likely a species of Kritosaurus either.‭ ‬Thus the creation of the Huallasaurus genus was established.
       Huallasaurus has a saurolophine hadrosaurid dinosaur that lived in South America during‭ ‬the late Cretaceous.‭ ‬Though regarded as different to Kritosaurus,‭ ‬Huallasaurus is still recognised as being‭ ‬very similar,‭ ‬hence its inclusion within the Kritosaurini group of hadrosaurs.‭ ‬Like others of its kind,‭ ‬Huallasaurus would have been a herbivore capable of browsing on a range of vegetation.

Further reading
-‭ ‬La Formación Los Alamitos‭ (‬Campaniano-Maastrichtiano‭) ‬del sudeste de Rio Negro,‭ ‬con descripcion de Kritosaurus australis n.‭ ‬sp.‭ (‬Hadrosauridae‭)‬.‭ ‬Significado paleogeografico de los vertebrados.‭ ‬-‭ ‬Revista de la Asociación Geológica Argentina‭ (‬in Spanish‭)‬.‭ ‬39‭ (‬3‭–‬4‭)‬:‭ ‬284‭–‬299.‭ ‬J.‭ ‬Bonaparte,‭ ‬M.‭ ‬R.‭ ‬Franchi,‭ ‬J.‭ ‬E.‭ ‬Powell‭ & ‬E.‭ ‬Sepulveda‭ ‬-‭ ‬1984.
-‭ ‬A re–evaluation of Secernosaurus koerneri and Kritosaurus australis‭ (‬Dinosauria,‭ ‬Hadrosauridae‭) ‬from the Late Cretaceous of Argentina.-‭ ‬Journal of Vertebrate Paleontology.‭ ‬30‭ (‬3‭)‬:‭ ‬813‭–‬837.‭ ‬-‭ ‬Alberto Prieto–Marquez‭ & ‬Guillermo C.‭ ‬Salinas‭ ‬-‭ ‬2010.
-‭ ‬South American hadrosaurs:‭ ‬considerations on their diversity.‭ ‬-‭ ‬Rodolfo Coria‭ ‬-‭ ‬2015.
-‭ ‬A new hadrosaurid‭ (‬Dinosauria:‭ ‬Ornithischia‭) ‬from the Late Cretaceous of northern Patagonia and the radiation of South American hadrosaurids.‭ ‬-‭ ‬Journal of Systematic Palaeontology.‭ ‬19‭ (‬17‭)‬:‭ ‬1207‭–‬1235.‭ ‬-‭ ‬Sebastián Rozadilla,‭ ‬Federico Brissón Egli,‭ ‬Federico Agnolin,‭ ‬Alexis Mauro Aranciaga-Rolando‭ & ‬Fernando Emilio Novas‭ ‬-‭ ‬2022.


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