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- Title
A new herrerasaurid (Dinosauria, Saurischia) from the Upper Triassic Ischigualasto Formation of northwestern Argentina.
- Authors
Alcober, Oscar A.; Martinez, Ricardo N.
- 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 sixthto eighthdorsal vertebrae, at least, bearing acute anterior and posterior processes; scapula and coracoid witheverted 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 withother dinosaurs suchas 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.
- Subjects
NORTHWEST Argentina; HERRERASAURIDAE; TRIASSIC Period; ANIMAL classification; CLADISTIC analysis; ANIMAL diversity; PALEONTOLOGICAL excavations
- Publication
ZooKeys, 2010, Vol 63, p55
- ISSN
1313-2989
- Publication type
Article
- DOI
10.3897/zookeys.63.550