MORPHOLOGICAL AFFINITIES OF RECENTLY DISCOVERED CERCOPITHECIDS FROM THE PLIOCENE UPPER LAETOLIL BEDS IN LAETOLI, TANZANIA by ELICIA F. ABELLA B.S., The Pennsylvania State University, 2012 A thesis submitted to the Faculty of the Graduate School of the University of Colorado in partial fulfillment of the requirements for the degree of Master of Arts Anthropology Program 2014