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Re: [dinosaur] Thanos, new abelisaurid theropod from Upper Cretaceous of Brazil



Good luck fitting the infinity gauntlet on this guy. :)

Jason

http://reptilis.net "I am impressed by the fact that we know less about many modern [reptile] types than we do of many fossil groups." - Alfred S. Romer


On Friday, November 16, 2018, 10:49:05 AM CST, Ben Creisler <bcreisler@gmail.com> wrote:



Ben Creisler


A new paper:

Thanos simonattoi, gen. et sp. nov.


Rafael Delcourt & Fabiano Vidoi Iori (2018)
A new Abelisauridae (Dinosauria: Theropoda) from SÃo Josà do Rio Preto Formation, Upper Cretaceous of Brazil and comments on the Bauru Group fauna.
Historical Biology (advance online publication)
DOI: 10.1080/08912963.2018.1546700



Abelisaurid theropods are well-know from the Cretaceous of several parts of the Southern Hemisphere, including South America, Madagascar, and Africa, but also in India and Europe. Abelisaurids are high-diverse among other theropods with several cervicocephalic specializations reaching medium/large sizes. In the present contribution, we describe a new abelisaurid (Thanos simonattoi, gen. et sp. nov.) from the SÃo Josà do Rio Preto Formation, Bauru Group, Brazil (Upper Cretaceous). Thanos differs from other theropods by having a well-developed keel becoming wider and deeper posteriorly on the ventral surface; two lateral small foramina separated by a relative wide wall on each lateral surface of the centrum, and well-developed and deep prezygapophyseal spinodiapophyseal fossae. The closed sutures between the axis and odontoid suggest that Thanos had reached a subadult/adult stage before death. Thanos is phylogenetically related to Brachyrostra abelisaurid. The keel on the ventral axial centrum in abelisauroids is here interpreted as a homoplastic condition that became more pronounced towards the phylogeny. The presence of well-developed keel in Thanos suggests that this taxon could be more derived than other abelisaurids. Finally, even though abelisaurids could reach large sizes, Thanos shared the environment with a larger theropod that was probably close to Megaraptora.


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