Artículo
Reconstruction of the pectoral girdle and forelimb musculature of Megaraptora (Dinosauria: Theropoda)
Aranciaga Rolando, Alexis Mauro
; Novas, Fernando Emilio
; Calvo, Jorge Orlando; Porfiri, Juan Domingo; Dos Santos, Domenica D.; Lamanna, Matthew C.
Fecha de publicación:
07/2023
Editorial:
John Wiley and Sons Inc
Revista:
Anatomical Record
ISSN:
1932-8486
e-ISSN:
1932-8494
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Megaraptora is a group of enigmatic, carnivorous non-avian theropod dinosaurs from the Cretaceous of Asia, Australia, and especially South America. Perhaps the most striking aspect of megaraptoran morphology is the large, robustly constructed forelimb that, in derived members of the clade, terminates in a greatly enlarged manus with hypertrophied, raptorial unguals on the medialmost two digits and a substantially smaller ungual on digit III. The unique forelimb anatomy of megaraptorans was presumably associated with distinctive functional specializations; nevertheless, its paleobiological significance has not been extensively explored. Here we draw from observations of the pectoral girdle and forelimb skeletons of Megaraptora and myological assessments of other archosaurian taxa to provide a comprehensive reconstruction of the musculature of this anatomical region in these singular theropods. Many muscle attachment sites on megaraptoran forelimb bones are remarkably well developed, which in turn suggests that the muscles themselves were functionally significant and important to the paleobiology of these theropods. Furthermore, many of these attachments became increasingly pronounced through megaraptoran evolutionary history, being substantially better developed in derived taxa such as Australovenator wintonensis and especially Megaraptor namunhuaiquii than in early branching forms such as Fukuiraptor kitadaniensis. When considered alongside previous range of motion hypotheses for Australovenator, our results indicate that megaraptorans possessed a morphologically and functionally specialized forelimb that was capable of complex movements. Notable among these were extensive extension and flexion, particularly in the highly derived manus, as well as enhanced humeral protraction, attributes that very probably aided in prey capture.
Palabras clave:
FORELIMB
,
MEGARAPTORA
,
MUSCULATURE
,
PALEOBIOLOGY
,
THEROPODA
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(MACNBR)
Articulos de MUSEO ARG.DE CS.NAT "BERNARDINO RIVADAVIA"
Articulos de MUSEO ARG.DE CS.NAT "BERNARDINO RIVADAVIA"
Citación
Aranciaga Rolando, Alexis Mauro; Novas, Fernando Emilio; Calvo, Jorge Orlando; Porfiri, Juan Domingo; Dos Santos, Domenica D.; et al.; Reconstruction of the pectoral girdle and forelimb musculature of Megaraptora (Dinosauria: Theropoda); John Wiley and Sons Inc; Anatomical Record; 306; 7; 7-2023; 1804-1823
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