Secernosaurus

Secernosaurus Temporal range: Late Cretaceous, 83–70 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Order:	†Ornithischia
Clade:	†Ornithopoda
Family:	†Hadrosauridae
Subfamily:	†Saurolophinae
Tribe:	†Kritosaurini
Genus:	†Secernosaurus Brett-Surman, 1979
Type species
†Secernosaurus koerneri Brett-Surman, 1979

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.^[1]

Description[]

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.^[2]

The type species is Secernosaurus koerneri, discovered by J.B. Abbot in 1923 and described in 1979. A species named in 1984, Kritosaurus australis, was thought to be synonymous in a 2010 study by Prieto–Marquez and Salinas.^[3] Further analysis proved the bones to belong to an entirely new genus. Thus, Huallasaurus australis was named by Rozadilla et al. (2022).^[4]

See also[]

• Timeline of hadrosaur research
• Kritosaurus

References[]

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