Archivo: Heterodontosaurus and Tianyulong
Description: Skull reconstructions of Heterodontosaurus and Tianyulong documenting moment arm lengths for Group 1 and 2 muscles. Heterodontosaurus tucki (A; based on SAM-PK-K1332) and Tianyulong confuciusi (B; redrawn from [30], areas of breakage shown in gray). Skulls are scaled to the same size (basal skull length). Black arrows indicate orientation of Group 1 (pointing posterodorsally) and Group 2 (pointing anterodorsally) muscles; see text for explanation of muscle groups and orientation of muscle vectors. Red lines indicate perpendicular moment arms between the jaw joint and Group 1 and 2 muscle vectors (or projections from these vectors, shown by dotted lines). Moment arms were then scaled by mandibular length to produce relative moment arm length for each muscle group in both taxa.
Title: Heterodontosaurus and Tianyulong
Credit: http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0031556
Author: Richard J. Butler1,2*, Laura B. Porro3, Peter M. Galton4,5, Luis M. Chiappe6
Usage Terms: Creative Commons Attribution 2.5
License: CC BY 2.5
License Link: http://creativecommons.org/licenses/by/2.5
Attribution Required?: Yes
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