Journal
HISTORICAL BIOLOGY
Volume 32, Issue 7, Pages 917-924Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/08912963.2018.1546700
Keywords
Theropods; Brachyrostra; vertebra; axis; Thanos simonattoi
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Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior [PNPD 1760064]
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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 Sao Jose do Rio Preto Formation, Bauru Group, Brazil (Upper Cretaceous).Thanosdiffers 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 thatThanoshad reached a subadult/adult stage before death.Thanosis 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 inThanossuggests that this taxon could be more derived than other abelisaurids. Finally, even though abelisaurids could reach large sizes,Thanosshared the environment with a larger theropod that was probably close to Megaraptora.
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