Secernosaurus

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Secernosaurus koerneri

Secernosaurus
Description de cette image, également commentée ci-après
Squelette de Secernosaurus koerneri (appelé précédemment Kritosaurus australis) au musée des sciences naturelles de Buenos-Aires.
Classification
Règne Animalia
Sous-embr. Chordata
Classe Sauropsida
Super-ordre Dinosauria
Ordre  Ornithischia
Sous-ordre  Ornithopoda
Super-famille  Hadrosauroidea
Famille  Hadrosauridae
Sous-famille  Saurolophinae
Tribu  Kritosaurini

Genre

 Secernosaurus
Brett-Surman[1], 1979

Nom binominal

 Secernosaurus koerneri
Brett-Surman[1], 1979

Synonymes

Secernosaurus est un genre éteint de dinosaures ornithopodes de la famille des hadrosauridés et de la sous-famille des saurolophinés ayant vécu en Amérique du Sud au cours de la fin du Crétacé supérieur. Ses fossiles ont été découverts en Argentine, dans les provinces de Río Negro et de Chubut dans des sédiments datés du Campanien supérieur et Maastrichtien inférieur, soit il y a environ 72 Ma (millions d'années).

C’était le seul genre d'hadrosauridés connu en Amérique du sud et, plus globalement sur l'ancien supercontinent de Gondwana jusqu'à la découverte en 2010, également en Argentine, de Willinakaqe[3].

Une seule espèce est rattachée au genre : Secernosaurus koerneri, décrite pour la première fois par Brett-Surman en 1979[1].

Étymologie[modifier | modifier le code]

Son nom signifie « reptile coupé » (dans le sens de « séparé » des autres), car lors de sa découverte, tous les hadrosaures connus avaient été découverts sur le supercontinent de la Laurasia (Amérique du Nord, en Europe, en Asie et en Afrique du Nord).

Description[modifier | modifier le code]

Les fossiles de l'holotype, référencé FMNH PR 13423, indiquent qu'il s'agirait d'un hadrosauridé sans crête et de petite taille, 3 mètres de long, 1,20 mètre de haut pour une masse de 200 à 400 kilos.

Cependant, le spécimen nommé initialement Kritosaurus australis et classé en 2010 comme un synonyme junior de Secernosaurus par Prieto-Márquez et Salinas[2] serait beaucoup plus grand, pouvant peut-être atteindre 8 mètres de longueur totale[4]. Cette mise en synonymie de Kritosaurus australis avec Secernosaurus est toutefois rejetée par Penélope Cruzado-Caballero et J. E. Powell en 2017 [5].

En 2018, une étude par tomodensitométrie et moulage de son endocrâne a montré une morphologie cérébrale très semblable à celle de tous les saurolophinés de l'hémisphère nord[6].

Classification[modifier | modifier le code]

Il fait partie de la famille des Hadrosauridae. A. Prieto-Marquez en 2014 place Secernosaurus dans la sous-famille des Saurolophinae et dans le clade (tribu) des Kritosaurini en compagnie des genres nord-américains : Kritosaurus, Gryposaurus et Naashoibitosaurus[7] et de Willinakaqe[8].

Phylogénie[modifier | modifier le code]

Le cladogramme ci-dessous a été réalisé par Prieto-Márquez et ses collègues en 2016[8]. Il précise leurs analyses précédentes de 2010 et 2014[9],[7]. Leur étude a pris en compte 61 espèces d'hadrosauridés caractérisées par 273 caractéristiques morphologiques (189 au niveau du crâne et 84 pour le squelette post-crânien). Secernosaurus y est positionné en groupe frère du genre argentin Willinakaqe :



Telmatosaurus





Jintasaurus



Lophorhothon





Claosaurus




Tethyshadros


Hadrosauridae

Hadrosaurus



Saurolophidae
Lambeosaurinae

Saurolophinae


Acristavus



Maiasaura



Brachylophosaurus






Naashoibitosaurus




Kritosaurus




Gryposaurus




« Big Bend UTEP 37.7 »



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"Sabinosaure" PASAC-1





Prosaurolophus




Augustynolophus



Saurolophus






Kerberosaurus




Kundurosaurus



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Notes et références[modifier | modifier le code]

  1. a b et c (en) M. K. Brett-Surman. 1979. Phylogeny and palaeobiogeography of hadrosaurian dinosaurs. Nature 277, p. 560-562
  2. a et b (en) Alberto Prieto–Marquez et Salinas, Guillermo C., « A re–evaluation of Secernosaurus koerneri and Kritosaurus australis (Dinosauria, Hadrosauridae) from the Late Cretaceous of Argentina », Journal of Vertebrate Paleontology, vol. 30, no 3,‎ , p. 813–837 (DOI 10.1080/02724631003763508)
  3. (en) Rubén D. Juárez Valieri, José A. Haro, Lucas E. Fiorelli et Jorge O. Calvo, « A new hadrosauroid (Dinosauria: Ornithopoda) from the Allen Formation (Late Cretaceous) of Patagonia, Argentina », Revista del Museo Argentino de Ciencias Naturales n.s., vol. 11, no 2,‎ , p. 217–231 (lire en ligne)
  4. (en) Holtz, Thomas R. Jr. (2011) Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages, Winter 2010 Appendix.
  5. (en) P. Cruzado-Caballero and J. E. Powell. 2017. Bonapartesaurus rionegrensis, a new hadrosaurine dinosaur from South America: implications for phylogenetic and biogeographic relations with North America. Journal of Vertebrate Paleontology 37(2):e1289381:1-16
  6. (en) Becerra, M.G., Paulina-Carabajal, A., Cruzado-Caballero, P., and Taborda, J.R.A. 2018. First endocranial description of a South American hadrosaurid: The neuroanatomy of Secernosaurus koerneri from the Late Cretaceous of Argentina. Acta Palaeontologica Polonica 63 (X) (PDF) First endocranial description of a South American hadrosaurid: The neuroanatomy of Secernosaurus koerneri from the Late Cretaceous of Argentina. Available from: https://www.researchgate.net/publication/327750380_First_endocranial_description_of_a_South_American_hadrosaurid_The_neuroanatomy_of_Secernosaurus_koerneri_from_the_Late_Cretaceous_of_Argentina [accessed Nov 04 2018]
  7. a et b (en) 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.
  8. a et b (en) A. Prieto-Marquez, G.M. Erickson et J.A. Ebersole, « A primitive hadrosaurid from southeastern North America and the origin and early evolution of 'duck-billed' dinosaurs », Journal of Vertebrate Paleontology, vol. 36, no 2,‎ , e1054495 (DOI 10.1080/02724634.2015.1054495)
  9. (en) A Prieto-Márquez, « Global phylogeny of Hadrosauridae (Dinosauria: Ornithopoda) using parsimony and Bayesian methods », Zoological Journal of the Linnean Society, vol. 159, no 2,‎ , p. 435–502 (DOI 10.1111/j.1096-3642.2009.00617.x)

Voir aussi[modifier | modifier le code]

Références taxinomiques[modifier | modifier le code]

(en) Référence Paleobiology Database : Secernosaurus koerneri Brett-Surman, 1979

Annexes[modifier | modifier le code]

Sur les autres projets Wikimedia :

Articles connexes[modifier | modifier le code]