Browsing by Author "Kay, Richard F"
Now showing items 1-20 of 20
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100 years of primate paleontology.
(American journal of physical anthropology, 2018-04) -
A diminutive Pliocene guenon from Kanapoi, West Turkana, Kenya.
(Journal of human evolution, 2019-10)Although modern guenons are diverse and abundant in Africa, the fossil record of this group is surprisingly sparse. In 2012 the West Turkana Paleo Project team recovered two associated molar teeth of a small primate from ... -
Biogeography in deep time - What do phylogenetics, geology, and paleoclimate tell us about early platyrrhine evolution?
(Molecular Phylogenetics and Evolution, 2015-01-01)© 2013 Elsevier Inc. Molecular data have converged on a consensus about the genus-level phylogeny of extant platyrrhine monkeys, but for most extinct taxa and certainly for those older than the Pleistocene we must rely upon ... -
Darwinius masillae is a strepsirrhine--a reply to Franzen et al. (2009).
(Journal of human evolution, 2010-11) -
Dental topographic change with macrowear and dietary inference in Homunculus patagonicus.
(Journal of human evolution, 2020-07)Homunculus patagonicus is a stem platyrrhine from the late Early Miocene, high-latitude Santa Cruz Formation, Argentina. Its distribution lies farther south than any extant platyrrhine species. Prior studies on the dietary ... -
Dietary inference from upper and lower molar morphology in platyrrhine primates.
(PLoS One, 2015)The correlation between diet and dental topography is of importance to paleontologists seeking to diagnose ecological adaptations in extinct taxa. Although the subject is well represented in the literature, few studies directly ... -
Dietary quality and encephalization in platyrrhine primates.
(Proc Biol Sci, 2012-02-22)The high energetic costs of building and maintaining large brains are thought to constrain encephalization. The 'expensive-tissue hypothesis' (ETH) proposes that primates (especially humans) overcame this constraint through ... -
Dust in the wind: How climate variables and volcanic dust affect rates of tooth wear in Central American howling monkeys.
(Am J Phys Anthropol, 2016-02)OBJECTIVES: Two factors have been considered important contributors to tooth wear: dietary abrasives in plant foods themselves and mineral particles adhering to ingested food. Each factor limits the functional life of teeth. ... -
Evidence for an Asian origin of stem anthropoids.
(Proc Natl Acad Sci U S A, 2012-06-26) -
First record of the Miocene hominoid Sivapithecus from Kutch, Gujarat state, western India.
(PloS one, 2018-01)Hominoid remains from Miocene deposits in India and Pakistan have played a pivotal role in understanding the evolution of great apes and humans since they were first described in the 19th Century. We describe here a hominoid ... -
Internal carotid arterial canal size and scaling in Euarchonta: Re-assessing implications for arterial patency and phylogenetic relationships in early fossil primates.
(J Hum Evol, 2016-08)Primate species typically differ from other mammals in having bony canals that enclose the branches of the internal carotid artery (ICA) as they pass through the middle ear. The presence and relative size of these canals ... -
Intraspecific variation in semicircular canal morphology-A missing element in adaptive scenarios?
(American journal of physical anthropology, 2019-01)OBJECTIVES:Recent evidence suggests that the amount of intraspecific variation in semicircular canal morphology may, itself, be evidence for varying levels of selection related to locomotor demands. To determine the extent ... -
Locomotor head movements and semicircular canal morphology in primates.
(Proc Natl Acad Sci U S A, 2012-10-30)Animal locomotion causes head rotations, which are detected by the semicircular canals of the inner ear. Morphologic features of the canals influence rotational sensitivity, and so it is hypothesized that locomotion and ... -
New World monkey origins
(SCIENCE, 2015-03-06) -
Parvimico materdei gen. et sp. nov.: A new platyrrhine from the Early Miocene of the Amazon Basin, Peru.
(Journal of human evolution, 2019-09)Three field seasons of exploration along the Río Alto Madre de Dios in Peruvian Amazonia have yielded a fauna of micromammals from a new locality AMD-45, at ∼12.8°S. So far we have identified the new primate described here ... -
Smooth operator: The effects of different 3D mesh retriangulation protocols on the computation of Dirichlet normal energy.
(American journal of physical anthropology, 2017-05)Dirichlet normal energy (DNE) is a metric of surface topography that has been used to evaluate the relationship between the surface complexity of primate cheek teeth and dietary categories. This study examines the effects ... -
Stem members of Platyrrhini are distinct from catarrhines in at least one derived cranial feature.
(Journal of human evolution, 2016-11)The pterion, on the lateral aspect of the cranium, is where the zygomatic, frontal, sphenoid, squamosal, and parietal bones approach and contact. The configuration of these bones distinguishes New and Old World anthropoids: ... -
The effect of differences in methodology among some recent applications of shearing quotients.
(Am J Phys Anthropol, 2015-01)A shearing quotient (SQ) is a way of quantitatively representing the Phase I shearing edges on a molar tooth. Ordinary or phylogenetic least squares regression is fit to data on log molar length (independent variable) and ... -
Unique nasal turbinal morphology reveals Homunculus patagonicus functionally converged on modern platyrrhine olfactory sensitivity.
(Journal of human evolution, 2022-04-21)The phyletic position of early Miocene platyrrhine Homunculus patagonicus is currently a matter of debate. Some regard it to be an early member of the Pitheciidae, represented today by the sakis, uakaris, and titi monkeys. ... -
Wear and its effects on dental topography measures in howling monkeys (Alouatta palliata).
(Am J Phys Anthropol, 2016-12)OBJECTIVES: Three dental topography measurements: Dirichlet Normal Energy (DNE), Relief Index (RFI), and Orientation Patch Count Rotated (OPCR) are examined for their interaction with measures of wear, within and between ...
