[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

[dinosaur] Macrocollum, new sauropodomorph from Late Triassic of Brazil

Ben Creisler

A new paper:

Macrocollum itaquii gen. & sp. nov.

Rodrigo Temp MÃller, Max Cardoso Langer & SÃrgio Dias-da-Silva (2018)
An exceptionally preserved association of complete dinosaur skeletons reveals the oldest long-necked sauropodomorphs.
Biology Letters 14: 20180633Â
DOI: 10.1098/rsbl.2018.0633

The rise of sauropodomorphs is still poorly understood due to the scarcity of well-preserved fossils in early Norian rocks. Here, we present an association of complete and exceptionally well-preserved dinosaur skeletons that helps fill that gap. They represent a new species, which is recovered as a member of a clade solely composed of Gondwanan Triassic taxa. The new species allows the definition of a set of anatomical changes that shaped sauropodomorph evolution along a period from 233 to 225 Ma, as recorded in the well dated Late Triassic beds of Brazil. In that time span, apart from achieving a more herbivorous diet, sauropodomorph dinosaurs increased their size in a ratio of 230% and their typical long neck was also established, becoming proportionally twice longer than those of basal taxa. Indeed, the new dinosaur is the oldest-known sauropodomorph with such an elongated neck, suggesting that the ability to feed on high vegetation was a key trait achieved along the early Norian. Finally, the clustered preservation mode of the skeletons represents the oldest evidence of gregarious behaviour among sauropodomorphs.






Virus-free. www.avg.com