Pelvic musculature of Vectidraco daisymorrisae and consequences for pterosaur locomotion

Abstract

AbstractThe unique morphology of pterosaurs makes them a compelling group to study, but the lack of ready analogues or descendant clades presents problems when inferring their biology and ecology. In this paper, the extant phylogenetic bracket is used to reconstruct the musculature of the pterosaurVectidraco daisymorrisaeand a detailed comparison is made between the musculature of this taxon and other reconstructions in the literature.M. iliofibularisis reconstructed as originating upon the angular process of the posterior iliac process, putting it into a mechanically advantageous position as an abductor.M. flexor tibialis internusis reconstructed as greatly enlarged over the ancestral state, probably in response to the reduction ofM. caudofemoralis brevisand the tail. This enlargement is considered to correspond to the increasing role ofM. flexor tibialis internusas a hip retractor.