Sarahsaurus

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Sarahsaurus aurifontanalis

Sarahsaurus
Description de cette image, également commentée ci-après
Différentes vues du crâne de Sarahsaurus aurifontanalis.
Classification
Règne Animalia
Embranchement Chordata
Classe Sauropsida
Super-ordre Dinosauria
Ordre Saurischia
Sous-ordre  Sauropodomorpha
Clade  Plateosauria
Clade  Massopoda

Genre

 Sarahsaurus
Timothy B. Rowe, Hans-Dieter Sues et Robert R. Reisz[1], 2011

Nom binominal

 Sarahsaurus aurifontanalis
Timothy B. Rowe, Hans-Dieter Sues et Robert R. Reisz[1], 2011

Sarahsaurus est un genre éteint de dinosaures sauropodomorphes, découvert en Arizona aux États-Unis où il a vécu au Jurassique inférieur (Sinémurien à Pliensbachien), soit il y a environ entre 199,3 à 182,7 millions d'années.

Une seule espèce est rattachée au genre : Sarahsaurus aurifontanalis, décrite en 2011 par Timothy B. Rowe, Hans-Dieter Sues et Robert R. Reisz[1].

Étymologie[modifier | modifier le code]

Le nom de genre Sarahsaurus rend hommage à Sarah Ernest Butler, associé au grec ancien « saûros » qui signifie « lézard » pour donner « lézard de Sarah Ernest Butler ». Le nom d'espèce aurifontanalis est composé des mots du latin aurum, « or », et fontanalis, « de la source/fontaine » en référence à Gold Spring en Arizona, où a été trouvé l'holotype.

Découverte[modifier | modifier le code]

Dessin des différents os de l'holotype.
Différentes vues du crâne de l'holotype.

L'holotype de Sarahsaurus est représenté par un squelette articulé (en connexion anatomique), presque complet, référencé TMM 43646-2, découvert dans la formation géologique de Kayenta. Un autre squelette partiel (TMM 43646-3) est connu, ainsi qu'un crâne mal conservé (MCZ 8893)[1]. Ce dernier spécimen avait été décrit à l'origine sous le nom de Massospondylus sp.[2].

Description[modifier | modifier le code]

Sarahsaurus mesurait environ 4,30 mètres de long, pour une masse de l'ordre de 110 kg, sans commune mesure avec les sauropodes qui lui succéderont au Crétacé. Il possède des mains très grandes et puissantes laissant penser qu'il était omnivore[3].

Classification[modifier | modifier le code]

Saurischia
Herrerasauridae

Herrerasaurus



Staurikosaurus





Eoraptor


Eusaurischia

Agnosphitys


Theropoda

Guaibasaurus




Chindesaurus



Neotheropoda




Sauropodomorpha
Saturnaliinae

Saturnalia



Chromogisaurus





Pantydraco




Thecodontosaurus




Efraasia




Plateosauravus


Plateosauria

Ruehleia


Plateosauridae

Unaysaurus



Plateosaurus



Massopoda
Riojasauridae

Eucnemesaurus



Riojasaurus





Sarahsaurus



Massospondylidae

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Jingshanosaurus















Voir aussi[modifier | modifier le code]

Références taxinomiques[modifier | modifier le code]

(en) Référence Paleobiology Database : Sarahsaurus Rowe et al., 2011

Annexes[modifier | modifier le code]

Sur les autres projets Wikimedia :

Articles connexes[modifier | modifier le code]

Notes et références[modifier | modifier le code]

Références[modifier | modifier le code]

  1. a b c et d (en) Timothy B. Rowe, Hans-Dieter Sues and Robert R. Reisz, « Dispersal and diversity in the earliest North American sauropodomorph dinosaurs, with a description of a new taxon », Proceedings of the Royal Society B: Biological Sciences, vol. 278, no 1708,‎ , p. 1044–1053 (PMID 20926438, PMCID 3049036, DOI 10.1098/rspb.2010.1867, lire en ligne)
  2. (en) J. Attridge, A.W. Crompton et Farish A. Jenkins Jr, « The southern Liassic prosauropod Massospondylus discovered in North America », Journal of Vertebrate Paleontology, vol. 5, no 2,‎ , p. 128–132 (DOI 10.1080/02724634.1985.10011850)
  3. (en) http://news.nationalgeographic.com/news/2010/10/101006-new-dinosaur-north-america-science/
  4. (en) Cecilia Apaldetti, Ricardo N. Martinez, Oscar A. Alcober and Diego Pol, « A New Basal Sauropodomorph (Dinosauria: Saurischia) from Quebrada del Barro Formation (Marayes-El Carrizal Basin), Northwestern Argentina », PLoS ONE, vol. 6, no 11,‎ , e26964 (PMID 22096511, PMCID 3212523, DOI 10.1371/journal.pone.0026964, lire en ligne)
  5. a et b (en) Alejandro Otero, Emil Krupandan, Diego Pol, Anusuya Chinsamy et Jonah Choiniere, « A new basal sauropodiform from South Africa and the phylogenetic relationships of basal sauropodomorphs », Zoological Journal of the Linnean Society, vol. 174, no 3,‎ , p. 589 (DOI 10.1111/zoj.12247)