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Comments on the pelvic girdle anatomy of Lagerpeton chanarensis Romer, 1971 (Archosauria) and its implications on the posture and gait of early pterosauromorphs.
Agnolín, Federico L; Novas, Fernando E; Ezcurra, Martín D; Miner, Santiago; Müller, Rodrigo Temp.
Afiliación
  • Agnolín FL; Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, CONICET-Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Buenos Aires, Argentina.
  • Novas FE; Fundación de Historia Natural "Félix de Azara," Departamento de Ciencias Naturales y Antropología, CEBBAD-Universidad Maimónides, Buenos Aires, Argentina.
  • Ezcurra MD; Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, CONICET-Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Buenos Aires, Argentina.
  • Miner S; Sección Paleontología de Vertebrados, CONICET-Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Buenos Aires, Argentina.
  • Müller RT; Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, CONICET-Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Buenos Aires, Argentina.
Anat Rec (Hoboken) ; 307(4): 1001-1010, 2024 Apr.
Article en En | MEDLINE | ID: mdl-38263641
ABSTRACT
Lagerpeton chanarensis is an early avemetatarsalian from the lower Carnian (lowermost Upper Triassic) levels of the Chañares Formation, La Rioja Province, Argentina. Lagerpeton and its kin were traditionally interpreted as dinosaur precursors of cursorial habits, with a bipedal posture and parasagittal gait. Some authors also speculated saltatorial capabilities for this genus. Recent analyses indicate that lagerpetids are early-diverging pterosauromorphs, a hypothesis that invites a review of most aspects of their anatomy and function. A revision of available specimens and additional preparation of previously known individuals indicate that Lagerpeton lacked a parasagittal gait and was probably a sprawling archosaur. This latter inference is based on the femoral head articulation with the acetabulum. The acetabular rim has a strongly laterally projected posteroventral antitrochanteric corner, which results in a position of the legs that recalls that of sprawling living reptiles, such as lizards, and departs from the parasagittally positioned limbs of dinosaurs. This may indicate that early pterosauromorphs had a sprawling posture of their hindlegs, casting doubts on the significance of bipedal posture and parasagittal gait for the radiation of early ornithodirans, given that both traits have been regarded as key features that triggered the ecological and evolutionary success of the clade. Our results bolster recent claims of a high ecomorphological diversity among early avemetatarsalians.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Dinosaurios / Lagartos Límite: Animals Idioma: En Revista: Anat Rec (Hoboken) Asunto de la revista: ANATOMIA Año: 2024 Tipo del documento: Article País de afiliación: Argentina Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Dinosaurios / Lagartos Límite: Animals Idioma: En Revista: Anat Rec (Hoboken) Asunto de la revista: ANATOMIA Año: 2024 Tipo del documento: Article País de afiliación: Argentina Pais de publicación: Estados Unidos