A Comparative Analysis Of Catarrhine And Platyrrhine Cranial Base Flexion
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Encephalization, Ontogenetic and Evolutionary Trends of Non-Hominoid Primates: A Comparative Analysis of Catarrhine and Platyrrhine Cranial Base Flexion.
MALEA K. NEESE
Department of Anthropology, University of Florida, Gainesville FL 32608 KEY WORDS encephalization, catarrhine, platyrrhine, cranial base, primate origins
ABSTRACT The primate cranial base has been an important structure to investigate for analyses involving facial, cranial, and brain morphology. Specifically, the basicranium has sparked interest because of the correlations found between the Cranial Base Angle (CBA) and brain size in non-hominoid primates. Previous studies have indicated that there may be a direct correlation between the degree of cranial base flexion and relative brain size in primates. Based upon this knowledge, it is possible to design hypotheses to test CBA correlation to relative brain size, encephalization rates, endocranial volume, and to investigate development of the cranial base and CBA ontogenetically. The study here will analyze these correlations by documenting cranial landmarks relative to linear length and size in order to establish planes and angle measurements. The data collected here will focus on comparing species from the parvorders Catarrhini and Platyrrhini to demonstrate that catarrhines show an evolutionary tendency towards higher encephalization and ergo a smaller (more flexed) CBA. Unlike previous studies, the analyses performed here will include