2011
DOI: 10.1002/jmor.10997
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Pelvic and hindlimb myology of the basal archosaur Poposaurus gracilis (archosauria: Poposauroidea)

Abstract: The discovery of a largely complete and well preserved specimen of Poposaurus gracilis has provided the opportunity to generate the first phylogenetically based reconstruction of pelvic and hindlimb musculature of an extinct nondinosaurian archosaur. As in dinosaurs, multiple lineages of basal archosaurs convergently evolved parasagittally erect limbs. However, in contrast to the laterally projecting acetabulum, or "buttress erect" hip morphology of ornithodirans, basal archosaurs evolved a very different, ven… Show more

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Cited by 52 publications
(154 citation statements)
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“…While noting differences in the magnitude of muscle leverage ( figures 3 and 4), we infer that stance phase lateral limb stability in bipedal suchians was achieved in the same manner as inferred for basal theropods, specifically a support phase abduction moment generated by the IF group (figure 7), represented by IFM in Poposaurus [18]. Given the triradiate arrangement of the pelvis, and the likely more upright posture and caudofemoralis-driven limb retraction, it is likely that femoral abduction predominantly countered the adduction GRF moment in Poposaurus, rather than medial rotation as in extant birds [10], which is greatly aided by enhanced muscle leverage for this action (figures 3 and 4).…”
Section: A L L I G a T O R G E K K O E U B L E P H A R I S G A L L U mentioning
confidence: 61%
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“…While noting differences in the magnitude of muscle leverage ( figures 3 and 4), we infer that stance phase lateral limb stability in bipedal suchians was achieved in the same manner as inferred for basal theropods, specifically a support phase abduction moment generated by the IF group (figure 7), represented by IFM in Poposaurus [18]. Given the triradiate arrangement of the pelvis, and the likely more upright posture and caudofemoralis-driven limb retraction, it is likely that femoral abduction predominantly countered the adduction GRF moment in Poposaurus, rather than medial rotation as in extant birds [10], which is greatly aided by enhanced muscle leverage for this action (figures 3 and 4).…”
Section: A L L I G a T O R G E K K O E U B L E P H A R I S G A L L U mentioning
confidence: 61%
“…Furthermore, differences in specific muscles are also evident in Poposaurus, notably the adductor group (ADD1 and 2) and CFB. A raised process midway down the caudal aspect of the femoral shaft and a vertically oriented ridge that extends distally from this process are reconstructed as the insertion sites of ADD1 and 2 in Poposaurus [18]. These insertion sites of the adductor complex in Poposaurus are significantly larger than those in any other archosaur, extinct or extant (see electronic supplementary material).…”
Section: Moment Arms and Neuromuscular Control Of Locomotion In Bipedmentioning
confidence: 99%
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“…Reconstructions of soft tissue anatomy are equally important as those of the skeleton because they can provide crucial information about locomotion, mode of life, and ecology of extinct animals (Witmer, 1995). For example, muscle reconstructions have been used to infer characteristics such as posture, maximum speed, and even possible gaits in extinct vertebrates (Russell, 1972;Sumida, 1989;Hutchinson & Garcia, 2002;Sellers et al, 2004Sellers et al, , 2009Hutchinson et al, 2005;Sellers & Manning, 2007;Bates et al, 2010;Schachner, Manning & Dodson, 2011). In addition, the ancestral configuration of the limbs is critical for understanding how constraints and adaptations led to the morphological diversity of modern tetrapod limbs.…”
Section: Introductionmentioning
confidence: 99%
“…Essa descrição assemelha-se ao verificado nesta pesquisa no jacaré-do-Pantanal. Para Schachner et al (2011), o m. puboisquiofemoral interno apresenta diferentes divisões em todos os sáurios existentes, sendo que os crocodilianos e a maioria dos lepidosauros têm dois componentes, ao passo que as aves e alguns esquamatas possuem três. Essa afirmação está de acordo com o descrito neste trabalho em C. yacare.…”
Section: Bases Musculares Do Filé Mignonunclassified