INVESTIGADORES
OTERO Alejandro
congresos y reuniones científicas
Título:
Muscular correlates on the appendicular skeleton of Skorpiovenator bustingorryi (Abelisauridae, Theropoda)
Autor/es:
MAURICIO CERRONI; ALEJANDRO OTERO; JUAN I. CANALE; FERNANDO NOVAS
Lugar:
San Luis
Reunión:
Congreso; Reunión Anula de Comunicaciones de la Asociación Paleontológica Argentina; 2017
Institución organizadora:
Asociación Paleontológica Argentina
Resumen:
The hindlimb anatomy of Abelisaurid theropods has been addressed in several contributions, but the osteological correlates associated to the hindlimb muscular arrangement in this family remains obscured. Skorpiovenator bustingorryi Canale, Scanferla, Agnolín and Novas 2008, is an abelisaurid theropod from the Late Cretaceous of North-western Patagonia, Argentina, which provides novel insight on the osteological correlates linked to the hindlimb myology. Under the Extant Phylogenetic Bracket, Tthe study resulted in a reconstruction of the sites of origin and insertionthe inference of 23 muscles, with a 76% of level I inferences (including I´) and 24% of level II and II´. The bone correlates includes reconstruction of several muscles as the m. ambiens, m. iliotibialis, m. femorotibialis, m. ileofemoralis externus, m. iliofibularis, m. caudofemoralis, m. iliotrochantericus caudalis, m. adductor femoris 1, m. gastrocnemii; furthermore, lower legs muscles as well as the extensor and flexor pedal muscles were reconstructed. Interestingly, and despite the difference of size, abelisaurids and tyrannosaurids share anteroposteriorly developed ilia and large tibial cnemial crest maybe related to a greater development of the flexor and extensor hindlimb muscles. Another feature of Skorpiovenator, is the development of the Mmmm. caudofemoralis due a strong 4º trochanter and a wide brevis fossa, which suggest an arrangement similar to crocodiles rather than birds; however, in Skorpiovenator (and perhaps abelisaurids) these muscles were likely more developed conferring a strong hindlimb retraction, probably increasing its cursorial abilities. This preliminary study constitutes the first attempt to reconstruct the hindlimb myology in a South American theropod dinosaur, increasing our knowledge on the hindlimb anatomy of abelisaurids.