Huallasaurus
Huallasaurus (meaning "duck lizard") is an extinct genus of saurolophine hadrosaur from the Late Cretaceous Los Alamitos Formation of Patagonia in Argentina. The type and only species is H. australis. Originally named as a species of Kritosaurus in 1984,[1] it was long considered a synonym of Secernosaurus[2] before being recognized as its own distinct genus in a 2022 study, different from other members of Kritosaurini.[3]
| Huallasaurus Temporal range: Late Cretaceous, ~ | |
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| Reconstructed skeleton at Museo de Ciencias Naturales | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Order: | †Ornithischia |
| Clade: | †Ornithopoda |
| Family: | †Hadrosauridae |
| Subfamily: | †Saurolophinae |
| Tribe: | †Kritosaurini |
| Genus: | †Huallasaurus Rozadilla et al., 2022 |
| Species: | †H. australis |
| Binomial name | |
| †Huallasaurus australis | |
| Synonyms | |
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Etymology
The generic name, "Huallasaurus," combines "hualla," the Mapudungun word for "duck," and the Greek "sauros," meaning "lizard." The specific name, "australis," is derived from the Latin "australis," meaning "southern," after the discovery of the holotype specimen in southern Argentina.[3][1]
Phylogeny
Depicted below is a reproduction of the phylogenetic tree produced by Rozadilla et al. (2022), including Huallasaurus and Kelumapusaura, which was described in the same study.[3]
| Hadrosauridae |
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Paleoecology
Huallasaurus is known from the Late Cretaceous Los Alamitos Formation of Río Negro Province, Argentina. Aeolosaurus rionegrinus, a titanosaurian sauropod, has also been named from this formation.[3]
References
- Bonaparte, José; Franchi, M.R.; Powell, J.E.; Sepulveda, E. (1984). "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.
- Prieto–Marquez, Alberto; Salinas, Guillermo C. (2010). "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. doi:10.1080/02724631003763508. S2CID 85814033.
- Rozadilla, Sebastián; Brissón-Egli, Federico; Lisandro Agnolín, Federico; Aranciaga-Rolando, Alexis Mauro; Novas, Fernando Emilio (2022). "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. doi:10.1080/14772019.2021.2020917. S2CID 247122005.
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