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Temporal range: Late Cretaceous, 85–66 Ma
Hadrosaur museum.jpg
Reconstructed skeleton
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Ornithischia
Suborder: Ornithopoda
Family: Hadrosauridae
Subfamily: Saurolophinae
Tribe: Kritosaurini
Genus: Secernosaurus
Brett-Surman 1979
Type species
Secernosaurus koerneri
Brett-Surman 1979

Kritosaurus australis Bonaparte, 1984

Secernosaurus (meaning "severed lizard") is a genus of herbivorous dinosaur. Secernosaurus was a hadrosaur, a "duck-billed" dinosaur which lived during the Late Cretaceous. Its fossils have been found in the Lago Colhué Huapi and Los Alamitos Formations of Argentina.


Its name comes from the fact that it lived in South America, which during the Mesozoic Era was part of the southern supercontinent of Gondwana. Most other hadrosaurs lived in the northern supercontinent of Laurasia, so it was separated from its relatives. It was believed to be the only hadrosaur from Gondwana until the discovery of Willinakaqe salitralensis in 2011.[1]

The type species is Secernosaurus koerneri, described in 1979. A species named in 1984, Kritosaurus australis, is thought to be synonymous.[2]

See also[edit]


  1. ^ Rubén D. Juárez Valieri; José A. Haro; Lucas E. Fiorelli & Jorge O. Calvo (2010). "A new hadrosauroid (Dinosauria: Ornithopoda) from the Allen Formation (Late Cretaceous) of Patagonia, Argentina" (PDF). Revista del Museo Argentino de Ciencias Naturales N.s. 11 (2): 217–231. Archived from the original (PDF) on 2011-09-03.
  2. ^ 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.

Further reading[edit]

  • M. K. Brett-Surman. 1979. Phylogeny and palaeobiogeography of hadrosaurian dinosaurs. Nature 277:560-562