Dinosaurs A to Z
Hadrosauridae

Huallasaurus

"duck lizard"

Generic ornithopod body-plan outline
You 1.8 m (5.9 ft) tall
Huallasaurus 9 m (29.5 ft) long
as long as 6 people standing fingertip to fingertip
generic ornithopod body plan, scaled to length — not a silhouette of Huallasaurus
Length
9 m (29.5 ft)
Period
Late Cretaceous (85–66 Mya)
Place
South America · Argentina
Food
Herbivore
Clade
Hadrosauridae Dinosauria Ornithischia Cerapoda Ornithopoda Iguanodontia Duck-billed dinosaurs with tooth batteries.

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.

What we know

  • Named by (Bonaparte et al., 1984).
  • Fossils found in South America and Argentina.

What we guess

The reconstruction notes for Huallasaurus — soft tissue, color, behavior — haven't been written up yet. Only the recorded basics above are filled in so far.