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SECERNOSAURUS

a plant-eating saurolophine iguanodont dinosaur from the Late Cretaceous of Argentina.
Pronunciation: see-SER-no-SOR-us
Meaning: Separated lizard
Author/s: Brett-Surman (1979)
Synonyms: Kritosaurus australis
First Discovery: Chubut, Argentina
Chart Position: 219

Secernosaurus koerneri

Secernosaurus is a species of duck-billed hadrosaurid, specifically a kritosaurinin saurolophine hadrosaurid, which hails from the Late Cretaceous Bajo Barreal Formation of Argentina. When described in 1979 it was the loneliest hadrosaurid too, living in South America (part of the northern supercontinent of Gondwana during the Mesozoic) while its relatives were all in North America, Europe or Asia (the southern supercontinent of Laurasia during the Mesozoic), and this separation is what prompted the name—Separated lizard.

At one point Secernosaurus had the company of another separated lizard—Kritosaurus australis ("kritos" also means separated, but in Greek rather than Latin, and in this case refers to its disjointed fossils)—until the latter turned out to be synonymous with the former, but there is some good news. In the early part of the 21st century paleontologists discovered two more Late Cretaceous South American hadrosaurids, Willinakaqe and Lapampasaurus, but they're all from different Provinces and we have no idea if they gathered socially.

Hadrosaurid remains are pretty rare in the Late Cretaceous Formations of South America while sauropods are many and varied, suggesting the latter were the dominant herbivores. In North America the situation is topsy-turvy.
(Koerner's separated lizard)Etymology
Secernosaurus is derived from the Latin "secerno" (sever, separate) and the Greek "sauros" (lizard), referring to the fact that this Gondwanan hadrosaurid was geographically severed from its Laurasian relatives.
The species epithet, koerneri, honors Dr. Harols E. Koerner, a professor at the University of Colorado.
Discovery
The remains of Secernosaurus were discovered at Lago Colhue Huapi in the "upper member" of the Bajo Barreal Formation (formerly "Laguna Palacios" in the San Jorge Formation), Rio Chico, Chubut, Argentina, and collected in 1923 by an expedition from The Field Museum (Chicago, IL) led by J. B. Abbott. The holotype (FMNH PR 13423) consists of a couple of vertebrae, some arm bones, a shoulder blade, a shin bone, bits of pelvis, and a partial braincase.
Estimations
Timeline:
Era: Mesozoic
Epoch: Late Cretaceous
Stage: Campanian-Maastrichtian
Age range: 84-66 mya
Stats:
Est. max. length: 8 meters
Est. max. hip height: ?
Est. max. weight: 2 tons
Diet: Herbivore
References
• Brett-Surman M. K. (1979) "Phylogeny and palaeobiogeography of hadrosaurian dinosaurs".
• Prieto–Marquez A. and Salinas G.C. (2010) "A re–evaluation of Secernosaurus koerneri and Kritosaurus australis (Dinosauria, Hadrosauridae) from the Late Cretaceous of Argentina".
• Horner J.R, Weishampel D.B. and Forster C.A. (2004) "Hadrosauridae" in Weishampel, Dodson and Osmólska (eds.) "The Dinosauria: Second Edition".
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To cite this page:
Atkinson, L. "SECERNOSAURUS :: from DinoChecker's dinosaur archive".
›. Web access: 17th Nov 2017.
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