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




Ben Creisler
bcreisler@gmail.com


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
http://rsbl.royalsocietypublishing.org/content/14/11/20180633



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.

News:

http://blogs.discovermagazine.com/deadthings/2018/11/20/dinosaur-brazil/#.W_UXuDhKjcs

https://www.independent.co.uk/news/science/dinosaur-bones-skeleton-brazil-south-america-discovery-vegetarian-a8643651.html

http://www.thelondoneconomic.com/news/one-of-the-earliest-of-the-long-necked-dinosaurs-has-been-dug-up-in-brazil/21/11/

https://www1.folha.uol.com.br/ciencia/2018/11/mais-antigo-dinossauro-pescocudo-e-brasileiro-dizem-pesquisadores.shtml


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