1. Doctoral Candidate in Kinesiology, Laboratory for the Comparative Study of Morphology, Mechanics, and Molecules, Dept. of Kinesiology, Pennsylvania State Univ., University Park, PA 16802 (corresponding author).
2. Professor of Developmental Genetics and Evolutionary Morphology, Laboratory for the Comparative Study of Morphology, Mechanics, and Molecules, Dept. of Kinesiology, Pennsylvania State Univ., University Park, PA 16802.