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RE: a new herrerasairid from the upper triassic, Ischigualasto formation, Argentina!
> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]
> On Behalf Of Pedro de Luna
> At Zookeys:
> Alcober, O.A., & R.N. Martínez. 2010. A new herrerasaurid
> (Dinosauria, Saurischia) from the Upper Triassic
> Ischigualasto Formation of northwestern Argentina. Zookeys 63.
> [Sanjuansaurus gordilloi]
> Peter Moon Ph.D.
Since it's at Zookeys, it is open access:
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.
Thomas R. Holtz, Jr.
Email: email@example.com Phone: 301-405-4084
Office: Centreville 1216
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
Faculty Director, Science & Global Change Program, College Park Scholars
Mailing Address: Thomas R. Holtz, Jr.
Department of Geology
Building 237, Room 1117
University of Maryland
College Park, MD 20742 USA