MACNBR 00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
BONE MICROSTRUCTURE OF ARCHOSAUROMORPHA FROM THE LATE TRIASSIC CHAÑARES FORMATION (CARNIAN) OF NW ARGENTINA
Autor/es:
GARCÍA MARSA, JORDI ALEXIS; NOVAS, FERNANDO E.; AGNOLIN, FEDERICO L.
Lugar:
La Plata
Reunión:
Congreso; XXXIX Reunión de Comunicaciones de la Asociación Paleontológica Argentina; 2019
Institución organizadora:
UNLP,; APA; CONICET
Resumen:
The Chañares Formation exhibits one of the most important archosauriform records of earlyCarnian ecosystems. Regarding previous histological studies of Lewisuchus admixtus, a taxa witha fast rate of growth, comparable with that seen in other basal Dinosauriformes and basaldinosaurs. Here we present new data onthehistology of Chañares archosauriforms and providenew insights into their paleobiology. Bone microstructure of Lagerpeton chanarensis andTropidosuchus romeri is dominated by fibro-lamellar tissue and dense vascularization. On theother hand, Chanaresuchus bonapartei is more densely vascularized, but with cyclical growthcharacterized by alternate fibro-lamellar, parallel-fibered and lamellar-zonal tissues. Densevascularization and fibro-lamellar tissue imply fast growth and high metabolic rates for all these taxa. Vascularization pattern also resembles Lewisuchus, but with a greater development in thelater taxon than in Lagerpeton and Tropidosuchus, and with a different vascular organizationrespect Chanaresuchus. These similarities and differences allow us purpose phylogeneticalaffinities, as well as provide paleoecological and behavioral implications.
