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The musculature of the pectoral region of representative rhamphorhynchoid (Campylognathoid.es) and large pterodactyloid (Anhanguera) pterosaurs was reconstructed in order to examine the function of various muscles and the functional consequences of the evolution of the advanced pectoral girdle of large pterodactyloids. The reconstructions suggest that m. supracora-coideus was not an elevator of the wing, but instead depressed and flexed the humerus, m. latissimus dorsi, m. teres major, m. deltoides scapularis, and m. scapulohumeralis anterior were wing elevators. Comparison of the origin, insertion and function of muscles in the rhamphorhynchoid and the large pterodactyloid suggests that...

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