Mammals from the Age of Dinosaurs: Origins, Evolution, and Structure
The Mesozoic Mammals in Space and Time and the Interrelationships of Mesozoics Mammals are studied to understand the distribution and relationships of these animals.
The Phylogeny of the Native South American Ungulates
- R. Cifelli
- Environmental Science
In quest for a phylogeny of Mesozoic mammals
A phylogeny of all major groups of Mesozoic mammals based on phylogenetic analyses of 46 taxa and 275 osteological and dental characters, using parsimony methods is proposed, suggesting that the “obtuse−angle symmetrodonts” are paraphyletic, and that they lack reliable and unambiguous synapomorphies.
Dual origin of tribosphenic mammals
Phylogenetic and morphometric analyses including these newly discovered taxa suggest a different interpretation: that mammals with tribosphenic molars are not monophyletic.
Osteology, paleobiology, and relationships of the sauropod dinosaur Sauroposeidon
Wedel, M.J., Cifelli, R.L., & Sanders, R.K. 2000. Osteology, paleobiology, and relationships of the sauropod dinosaur Sauroposeidon. -Acta Palaeontologica Polonica 45,4, 343-388. Sauroposeidon…
Eutherian tarsals from the late Paleocene of Brazil. American Museum novitates ; no. 2761
- R. Cifelli
Disassociated eutherian proximal tarsals from Riochican fissure fills near Sao Jose de Itaborai, Rio de Janeiro, Brazil, are described and, where feasible, are assigned to dental species from that locality, based on predicted morphology, relative size, and relative abundance.
High-precision 40Ar/39Ar geochronology and the advent of North America's Late Cretaceous terrestrial fauna.
- R. Cifelli, J. Kirkland, A. Weil, A. Deino, B. Kowallis
- Environmental Science, GeographyProceedings of the National Academy of Sciences…
- 14 October 1997
A densely sampled, diverse new fauna from the uppermost Cedar Mountain Formation, Utah, indicates that the basic pattern of faunal composition for the Late Cretaceous of North America was already…
The origin and affinities of the South American Condylarthra and early Tertiary Litopterna (Mammalia). American Museum novitates ; no. 2772
- R. Cifelli
Magnetic Polarity Stratigraphy and Mammalian Fauna of the Deseadan (Late Oligocene-Early Miocene) Salla Beds of Northern Bolivia
The Salla Beds contain a rich assemblage of Deseadan mammals that traditionally has been considered of early Oligocene age. These deposits, located 90-100 km SE of La Paz, Bolivia, consist of more…