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a plant-eating saurolophine iguanodont dinosaur from the Late Cretaceous of North America.
Pronunciation: KRIT-oh-SOR-us
Meaning: Separated lizard
Author/s: Brown (1910)
Synonyms: See below
First Discovery: New Mexico, USA
Chart Position: 71

Kritosaurus navajovius

When Barnum Brown first described Kritosaurus he chose the name Nectosaurus and rebuilt its missing snout in the flat, ducky vision of what would become known as Anatotitan. As it happens, Nectosaurus was already occupied by a marine reptile (named by John C. Merriam, 1905) so Brown coined Kritosaurus as a replacement name in 1910 and six years later it received a facelift. Literally.

In 1916 Kritosaurus was restored with an arched snout, an idea Brown had nicked from Gilmore's Gryposaurus, and both paleontologists suspected they may be the same creature. After the 1942 publication of Lull and Wright's monograph on hadrosaurs Gryposaurus was sunk into Kritosaurus under the first name stands rule and there it spent the next fifty odd years.

By the 1990s the validity of Kritosaurus was being called into question, and the "separated lizard" was separated again, from Gryposaurus, due mainly to its shabby remains and the whiff of uncertainty that surrounded them. At least for now, the slightly younger and primarily Canadian Gryposaurus is Gryposaurus again and gaining momentum, while Kritosaurus is fading into obscurity and receives only passing mention, mainly because of the dinosaurs that it has been historically entangled with.
(Separated lizard of the Navajo) Etymology
Kritosaurus is derived from the Greek "kritos" (separated—referring to the separation of its "weathered out" skull bones) and "sauros" (lizard). The species epithet, navajovius, honors the Navajo Indians who inhabited the area.
The remains of Kritosaurus were discovered in the De-na-zin Member of the Kirtland Formation, near Ojo Alamo, San Juan County, New Mexico, USA, by Barnum Brown on August 27th 1904, after the report of "numerous fossils" in the area by George Hubbard Pepper of the Hyde Exploring Expeditions in 1902. The holotype (AMNH 5799) is a partial and poorly-preserved skull.
Era: Mesozoic
Epoch: Late Cretaceous
Stage: Campanian
Age range: 80-73 mya
Est. max. length: 9 meters
Est. max. hip height: ?
Est. max. weight: 2.5 tons
Diet: Herbivore
Other Species
"Kritosaurus australis" (Bonaparte, 1984) was sunk into Secernosaurus koerneri—one of the few South American hadrosaurids—as a junior synonym by Albert Prieto-Marquez and Guillermo C. Salinas in 2010.
"Kritosaurus incurvimanus" (Brown, 1919) is considered a synonym of Gryposaurus notabilis.
?Anasazisaurus horneri (Hunt and Lucas, 1993)
?Naashoibitosaurus ostromi (Hunt and Lucas, 1993)
• Brown B (1910) "The Cretaceous Ojo Alamo beds of New Mexico with description of the new dinosaur genus Kritosaurus". Bulletin of the AMNH; v. 28, article 24.
• Horner JR (1992) "Cranial morphology of Prosaurolophus(Ornithischia: Hadrosauridae) with descriptions of two new hadrosaurid species and an evaluation of hadrosaurid phylogenetic relationships". Museum of the Rockies Occasional Paper. 2: 1–119.
• Hunt AP and Lucas SG (1992) "Stratigraphy, paleontology, and age of the Fruitland and Kirtland Formations (Upper Cretaceous) San Juan Basin, New Mexico". Page 217–239 in Lucas, Kues, Williamson and Hunt, (eds.) New Mexico Geological Society Guidebook 43. New Mexico Geological Society.
• Horner JR, Weishampel DB and Forster CA (2004) "Hadrosauridae" in Weishampel, Osmólska and Dodson (eds.) "The Dinosauria: Second Edition".
• Prieto-Márquez A, DB Weishampel and JR Horner (2006) "The dinosaur Hadrosaurus foulkii, from the Campanian of the East Coast of North America, with a reevaluation of the genus". Acta Palaeontologica Polonica 51 (1): 77–98.
• Alberto Prieto-Marquez and Guillermo C. Salinas (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.
• Dingus L and MA Norell (2011) "Barnum Brown: The Man Who Discovered Tyrannosaurus rex".
• Prieto-Márquez A (2014) "Skeletal morphology of Kritosaurus navajovius (Dinosauria:Hadrosauridae) from the Late Cretaceous of the North American south-west, with an evaluation of the phylogenetic systematics and biogeography of Kritosaurini". Journal of Systematic Palaeontology 12(2): 133-175.
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To cite this page:
Atkinson, L. "KRITOSAURUS :: from DinoChecker's dinosaur archive".
›. Web access: 18th Feb 2018.