Richard Frederick Kay
Professor of Evolutionary Anthropology
I have two areas of research:1) the evolution of primates in South America; and 2) the use of primate anatomy to reconstruct the phylogenetic history and adapations of living and extinct primates, especially Anthropoidea.
1) Evolution of primates and mammalian faunal evolution, especially in South America. For the past 30 years, I have been engaged in research in Argentina, Bolivia The Dominican Republic, Peru, and Colombia with three objectives:a) to reconstruct the evolutionary history and adaptive patterns of South America primates and other mammals; b) to establish a more precise geologic chronology for the mammalian faunas between the late Eocene and middle Miocene (between about 36 and about 15 million years ago); and c) to use anatomy and niche structure of modern mammals as a means to reconstruct the evolution of mammalian niche structure in the Neotropics.
2) Primate Anatomy. I am working to reconstruct the phylogeny of primates based (principally) on anatomical evidence; and to infer the adaptations of extinct primates based mainly on cranial and dental evidence.
Current fieldwork is focused on the study of terrestrial biotic change in Patagonia through the 'mid-Miocene Climate Optimum' when global climate was moderate and the subtropical zone, with primates and other typically tropical vertebrates, extended their ranges up to 55 degrees of South latitude.
In this collaborative research undertaking with colleagues at University of Washington and Boise State University, the geochronology of the Santa Cruz Formation at in extreme southern Argentina is being refined using radiometric dating. Stratigraphically-controlled collections have been made of vertebrates and plant macro- and microfossils. Climate change and its impact on the biota is assessed 1) using biogeochemical analysis of stable isotopes in fossil mammalian tooth enamel; 2) by documenting changes in mammalian community structure (richness, origination and extinction rates, and ecological morphology); and 3) by documenting changes in vegetation and floral composition through the study of phytoliths. These three independent lines of evidence in a refined geochronologic framework will then be compared with similar evidence from continental sequences in the Northern Hemisphere and oceanic climatic records to improve our understanding of the timing and character of climatic change in continental high latitudes during this temporal interval.
A second field project project in its early stages is the study of the fossil vertebrates of the Amazon Basin. The latter is a collaborative effort of biologists and geologists across schools at Duke (Nicholas School) and among six North American universities. My role is to direct the vertebrate paleontology component of this project in Brazil and Amazonian Peru. The hope is to recover primates from the Oligocene through Early Miocene. New material will shed light on the phylogenetic status of African Paleogene anthropoids, one of which may be the platyrrhine sister-taxon. Also, new remains of fossil primates will help to refine hypotheses about the origins of the modern families and subfamilies of platyrrhines, all of which trace back to an Early Miocene (17-21 Ma) common ancestor. Finally, new fossil primates may further constrain the time of entry of platyrrhines into South America.
Kay, RF. "Molar structure and diet in extant Cercopithecoidea." Development, Function and Evolution of Teeth. Ed. PM Butler and K Joysey. London: Academic Press, 1978. 309-339.
Kay, RF, and Hiiemae, KM. "Mastication in Galago crassicaudatus, a cinefluorographic and occlusal study." Prosimian Biology. Ed. RD Martin, GA Doyle, and AC Walker. London: Duckworth, 1974. 501-530.
Hiiemae, KM, and Kay, RF. "Evolutionary trends in the dynamics of primate mastication." Symp. Fourth Int. Cong. Primatology, Vol 3: Craniofacial Biology of Primates. Ed. MR Zingeser. Basel: Karger, 1973. 28-64.
Hiiemae, KM, and Kay, RF. "Evolutionary trends in the dynamics of primate mastication." 1973. 28-64.
Kay, RF, Vizcaino, S, Tauber, AA, Bargo, MS, Williams, BA, Luna, C, and Colbert, MW. "Three newly discovered skulls of Homunculus patagonicus support its position as a stem platyrrhine and establish its diurnal arboreal folivorous habits." AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY (2005): 127-127.
Kay, RF, Campbell, VM, Rossie, JB, Colbert, MW, and Rowe, TB. "Olfactory fossa of Tremacebus harringtoni (platyrrhini, early Miocene, Sacanana, Argentina): implications for activity pattern." Anat Rec A Discov Mol Cell Evol Biol 281.1 (November 2004): 1157-1172. Full Text
Kay, RF, Schmitt, D, Vinyard, CJ, Perry, JMG, Shigehara, N, Takai, M, and Egi, N. "The paleobiology of Amphipithecidae, South Asian late Eocene primates." J Hum Evol 46.1 (January 2004): 3-25.
Vizcaino, SF, Bargo, MS, Tauber, AA, and Kay, RF. "The armadillos (Mammalia, Xenarthra) of the Santa Cruz Formation (Early-Middle Miocene). An approach to their paleobiology." Ameghiniana (2004).
Tauber, AA, Vizcaino, SF, Kay, RF, Bargo, MS, and Luna, C. "Aspectos biostratigráficos y paleoecológicos de la Formación Santa Cruz (Mioceno temprano-medio) de Patagonia, Argentina." Ameghiniana (2004).
Tauber, AA, Kay, RF, Luna, C, and Palacoos, ME. "Aspectos paleoambientales de la Formacion Santa Cruz (Mioeno temprano-medio) en Killik Aike Norte, Patagonia, Argentina." Asociacion Paleontologica Argentina, Reunin Anual de Communicaciones (2004): 26-.
Tauber, AA, Kay, RF, and Luna, C. "Killik Aike Norte, una localidad clásica de la Formación Santa Cruz (Mioceno temprano-medio), Patagonia, Argentina." Ameghiniana Resúmenes, 2004 (2004): 26-.
Madden, R, Kay, RF, Heizler, M, Vilas, F, and Re, G. "Geochronology of the Sarmiento Formation at Gran Barranca and Elsewhere in Patagonia: Calibrating Middle Cenozoic Mammal Evolution in South America." Journal of Vertebrate Paleontology 24 (2004): 87A-.
Bellosi, ES, Madden, R, and Kay, RF. "Discontinuidades estratigráficas de la Formación Sarmiento en Gran Barranca (Patagonia central): evaluación preliminary de la integridad de su registro." Resumenes de Comunicaciones de la Asociación Argentina de Paleontologia (Diamante, Argentina) 2004 (2004): 6-7.
Kohn, MJ, Josef, JA, Madden, R, Kay, R, Vucetich, G, and Carlini, AA. "Climate stability across the Eocene-Oligocene transition, southern Argentina." Geology 32.7 (2004): 621-624. Full Text
Madden, RH, and Kay, RF. "Aportes al conocimiento de la fauna de mamiferos del Grupo Honda, Mioceno, Colombia." 1992.
Kay, RF, and Anthony, MRL. "Dietary evolution in platyrrhine primates and the comparative method." 1991.
Ford, SM, Davis, LC, and Kay, RF. "New platyrrhine astragalus from the Miocene of Colombia." 1991.
KAY, RF. "A POSSIBLE GIANT TAMARIN FROM THE MIOCENE OF COLOMBIA." February 1990.
MADDEN, RH, and KAY, RF. "NEW STIRTONIA-VICTORIAE MATERIAL FROM THE MIOCENE OF COLOMBIA." October 1987.
KAY, RF, and COVERT, HH. "SPECIES NUMBER DETERMINATION AND SPECIMEN ALLOCATION IN FOSSIL SAMPLES." 1982.
SIMONS, EL, KAY, RF, and FLEAGLE, JG. "RECENTLY RECOVERED OLIGOCENE APES FROM EGYPT." 1980.
KAY, RF, and SHEINE, WS. "MODEL FOR COMPARISON OF MASTICATORY EFFICIENCY IN PRIMATES." 1978.
KAY, RF. "POST-OLIGOCENE EVOLUTION OF CATARRHINE DIETS." 1977.