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Temporal range: Late Cretaceous, Maastrichtian
Mount labeled Kritosaurus australis, a synonym of S. koerneri
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
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 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 hadrosaur from Gondwana until the discovery of Willinakaqe salitralensis in 2011.[1]

Mounted skeleton

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]


  • M. K. Brett-Surman. 1979. Phylogeny and palaeobiogeography of hadrosaurian dinosaurs. Nature 277:560-562
  1. ^ Rubén D. Juárez Valieri, José A. Haro, Lucas E. Fiorelli and 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. 
  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.