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Basal sauropodomorphs from Triassic Ischigualasto Formation of Argentina



From: Ben Creisler
bcreisler@gmail.com


A paper in the new JVP Memoir:

Ricardo N. MartÍnez, Cecilia Apaldetti & Diego Abelin (2013)
Basal sauropodomorphs from the Ischigualasto Formation.
Basal sauropodomorphs and the vertebrate fossil record of the
Ischigualasto Formation (Late Triassic: Carnian-Norian) of Argentina.
Journal of Vertebrate Paleontology Memoir 12:   51-69
DOI:10.1080/02724634.2013.819361
http://www.tandfonline.com/doi/full/10.1080/02724634.2013.819361#.UlTBgVB6YYE

Basal sauropodomorphs from the Ischigualasto Formation include
Eoraptor lunensis, Panphagia protos, and Chromogisaurus novasi. Few
comparisons have been made between these taxa, because Eoraptor was
only recently reassessed as a basal sauropodomorph and because
Panphagia and Chromogisaurus were described nearly simultaneously. We
describe in detail the fully prepared bones of the holotype of
Chromogisaurus novasi, examine the evidence for its taxonomic
distinction, and analyze the phylogenetic relationships among basal
sauropodomorphs. Our results support Chromogisaurus novasi as a valid
genus and species and provide weak phylogenetic evidence favoring a
series of stem taxa at the base of Sauropodomorpha. The analysis
positions Panphagia as the basal-most sauropodomorph, followed by
Eoraptor, Pampadromaeus, and a clade that includes Chromogisaurus and
Saturnalia.