My work falls into four general areas: (1) Origin of major evolutionary adaptations. Through a synthesis of phylogenetic, functional, and comparative morphological evidence, I try to assemble the best-supported evolutionary sequences available and to reconstruct the steps by which major adaptations, particularly flight, arise. (2) The beginning of the "Age of Dinosaurs." Although I work generally on Mesozoic vertebrate paleontology, I am most interested in the changes in the terrestrial vertebrate fauna that took place around the Triassic-Jurassic boundary. (3) Systematics, functional morphology, and flight of pterosaurs. Pterosaurs, the first vertebrates to gain powered flight, provide many interesting keys to the evolution of posture, locomotion, homeothemy, and vertebrate adaptation in the early Mesozoic Era. (4) Histology and constructional morphology of the bones of extinct reptiles. Comparative bone histology in a phylogenetic series of taxa and some ontogenetic series can provide the best picture of age, growth, and metabolism, and engineering design helps to understand functional adaptations of bone. Our histology work is in conjunction with other researchers in California, Montana, and France.
Padian, K., and J.R. Horner. 2002. Typology versus transformation in the origin of birds. Trends in Ecology and Evolution 17:120-124.
Padian, K., A.J. de RicqlÂ?s, and J.R. Horner. 2001. Dinosaurian growth rates and bird origins. Nature 412:405-408.
Horner, J.R., A.J. de RicqlÂ?s, and K. Padian. 2001. Comparative osteohistology of some embryonic and perinatal archosaurs: phylogenetic and behavioral implications for dinosaurs. Paleobiology 27(1):39-58.
RicqlÂ?s, A.J. de, K. Padian, J.R. Horner, and H. Francillon-Viellot. 2000. Paleohistology of the bones of pterosaurs (Reptilia: Archosauria): anatomy, ontogeny, and biomechanical implications. Zoological Journal of the Linnean Society 129:349-385.
Padian, K. 1999. Charles Darwin's views of classification in theory and in practice. Systematic Biology 48:352-364.
Padian, K., and L.M. Chiappe. 1998. The origin and early evolution of birds. Biological Reviews, Cambridge 73:1-42.
Padian, K., and J.M.V. Rayner. 1993. The wings of pterosaurs. Am. J. Sci. 293-A:91-166.