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A new herrerasaurid (Dinosauria, Saurischia) from the Upper Triassic Ischigualasto Formation of northwestern Argentina.
Zookeys. 2010 Oct 19Z

Abstract

Herrerasauridae comprises a basal clade of dinosaurs best known from the Upper Triassic of Argentina and Brazil, which have yielded remains of Herrerasaurus ischigualastensis and Staurikosaurus pricei, respectively. Systematic opinion regarding the position of Herrerasauridae at the base of Dinosauria has varied. Here we describe a new herrerasaurid, Sanjuansaurus gordilloi gen. n., sp. n., based on a partial skeleton from Carnian-age strata of the the Upper Triassic Ischigualasto Formation of northwestern Argentina. The new taxon is diagnosed by numerous features, including long, band-shaped and posterolaterally oriented transverse process on the posterior cervical vertebrae; neural spines of the sixth to eighth dorsal vertebrae, at least, bearing acute anterior and posterior processes; scapula and coracoid with everted lateral margins of the glenoid; and short pubis (63% of the femoral length). Phylogenetic analysis placed Sanjuansaurus within a monophyletic Herrerasauridae, at the base of Theropoda and including Herrerasaurus and Staurikosaurus. The presence of Sanjuansaurus at the base of the Ischigualasto Formation, along with other dinosaurs such as Herrerasaurus, Eoraptor, Panphagia, and Chromogisaurus suggests that saurischian dinosaurs in southwestern Pangea were already widely diversified by the late Carnian rather than increasing in diversity across the Carnian-Norian boundary.

Authors+Show Affiliations

Museo de Ciencias Naturales, San Juan 5400, Argentina.No affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

21594020

Citation

Alcober, Oscar A., and Ricardo N. Martinez. "A New Herrerasaurid (Dinosauria, Saurischia) From the Upper Triassic Ischigualasto Formation of Northwestern Argentina." ZooKeys, 2010, pp. 55-81.
Alcober OA, Martinez RN. A new herrerasaurid (Dinosauria, Saurischia) from the Upper Triassic Ischigualasto Formation of northwestern Argentina. Zookeys. 2010.
Alcober, O. A., & Martinez, R. N. (2010). A new herrerasaurid (Dinosauria, Saurischia) from the Upper Triassic Ischigualasto Formation of northwestern Argentina. ZooKeys, (63), 55-81. https://doi.org/10.3897/zookeys.63.550
Alcober OA, Martinez RN. A New Herrerasaurid (Dinosauria, Saurischia) From the Upper Triassic Ischigualasto Formation of Northwestern Argentina. Zookeys. 2010 Oct 19;(63)55-81. PubMed PMID: 21594020.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A new herrerasaurid (Dinosauria, Saurischia) from the Upper Triassic Ischigualasto Formation of northwestern Argentina. AU - Alcober,Oscar A, AU - Martinez,Ricardo N, Y1 - 2010/10/19/ PY - 2010/6/11/received PY - 2010/9/23/accepted PY - 2011/5/20/entrez PY - 2010/1/1/pubmed PY - 2010/1/1/medline KW - Carnian KW - Dinosauria KW - Herrerasauridae KW - Ischigualasto KW - Saurischia SP - 55 EP - 81 JF - ZooKeys JO - Zookeys IS - 63 N2 - Herrerasauridae comprises a basal clade of dinosaurs best known from the Upper Triassic of Argentina and Brazil, which have yielded remains of Herrerasaurus ischigualastensis and Staurikosaurus pricei, respectively. Systematic opinion regarding the position of Herrerasauridae at the base of Dinosauria has varied. Here we describe a new herrerasaurid, Sanjuansaurus gordilloi gen. n., sp. n., based on a partial skeleton from Carnian-age strata of the the Upper Triassic Ischigualasto Formation of northwestern Argentina. The new taxon is diagnosed by numerous features, including long, band-shaped and posterolaterally oriented transverse process on the posterior cervical vertebrae; neural spines of the sixth to eighth dorsal vertebrae, at least, bearing acute anterior and posterior processes; scapula and coracoid with everted lateral margins of the glenoid; and short pubis (63% of the femoral length). Phylogenetic analysis placed Sanjuansaurus within a monophyletic Herrerasauridae, at the base of Theropoda and including Herrerasaurus and Staurikosaurus. The presence of Sanjuansaurus at the base of the Ischigualasto Formation, along with other dinosaurs such as Herrerasaurus, Eoraptor, Panphagia, and Chromogisaurus suggests that saurischian dinosaurs in southwestern Pangea were already widely diversified by the late Carnian rather than increasing in diversity across the Carnian-Norian boundary. SN - 1313-2970 UR - https://www.unboundmedicine.com/medline/citation/21594020/A_new_herrerasaurid__Dinosauria_Saurischia__from_the_Upper_Triassic_Ischigualasto_Formation_of_northwestern_Argentina_ DB - PRIME DP - Unbound Medicine ER -
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