Extinct genus of dinosaur
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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, it was long considered a synonym of "Secernosaurus" before being recognized as its own distinct genus in a 2022 study, different from other members of Kritosaurini.
Discovery.
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.
Classification.
Rozadilla "et al". (2022) named "Huallasaurus" and the closely related "Kelumapusaura", recovering them in a clade of entirely South American saurolophines. In the 2023 description of the South American hadrosauroid "Gonkoken", Alarcón-Muñoz "et al". recovered similar results, implementing a modified version of the phylogenetic matrix of Rozadilla "et al". They named the clade containing "Huallasaurus", "Kelumapusaura", and other South American saurolophines as the Austrokritosauria, recovering it as the sister taxon to the Kritosaurini. The results of their phylogenetic analyses of Saurolophinae are displayed in the cladogram below:
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.
References.
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