Thanos simonattoi

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Thanos
Temporal range: Santonian
Thanos simonattoi.png
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Saurischia
Suborder: Theropoda
Family: Abelisauridae
Clade: Brachyrostra
Genus: Thanos
Delcourt and Iori, 2018
Species:
T. simonattoi
Binomial name
Thanos simonattoi
Delcourt and Iori, 2018

Thanos (named for the Marvel Comics character) is a genus of carnivorous brachyrostran abelisaurid dinosaur that lived in Brazil during the Santonian stage of the late Cretaceous Period. It contains a single species, Thanos simonattoi.[1]

Discovery and naming[edit]

In 2014, it was reported in the scientific literature that Sérgio Luis Simonatto with a team of the Museu de Paleontologia "Prof. Antonio Celso de Arruda Campos" had found the front of a theropod axis near São José do Rio Preto.[2] Several years later Fabiano Vidoi Iori uncovered the rear part of the same vertebra.[1]

In 2018, the type species Thanos simonattoi was named and described by Rafael Delcourt and Fabiano Vidoi Iori. The generic name refers to the Marvel Comics character Thanos, invented by Jim Starlin. The character's name is itself derived from the Greek θάνατος, thanatos, "death". The specific name honours Simonatto.[1]

The holotype specimen, MPMA 08–0016/95, was found in the São José do Rio Preto Formation, part of the Bauru Group and dating from the Santonian; in 2014 it had been dated to the Maastrichtian. It consists of an almost complete axis fused with an axial intercentrum. It is missing several processes at the front, rear and sides. The specimen is currently housed at the Museu de Paleontologia de Monte Alto, Brazil.[1]

Description[edit]

The length of Thanos has been estimated at 5.5–6.5 metres (18–21 ft).[1]

Despite the incompleteness of the material, a number of diagnostic features are present; a well-developed keel becoming wider and deeper posteriorly on the ventral surface; two lateral small foramina separated by a relatively wide wall on each lateral surface of the centrum; and well-developed and deep prezygapophyseal spinodiapophyseal fossae. In view of these features, Thanos may have been more derived than other abelisaurids at the time.[1]

Phylogeny[edit]

In their phylogenetic analysis, Delcourt and Iori (2018) recovered Thanos in a large polytomy with other brachyrostrans within the Abelisauridae. Their resulting cladogram is shown below:[1]

Abelisauridae

Chenanisaurus

Pourcieux taxon

"Kryptops"

Rugops

Majungasaurinae

Rajasaurus

Indosaurus

Majungasaurus

Genusaurus

Arcovenator

La Boucharde Taxon

Brachyrostra

Thanos

Viavenator

Carnotaurus

Aucasaurus

Abelisaurus

Quilmesaurus

Pycnonemosaurus

Skorpiovenator

Ekrixinatosaurus

Ilokelesia

Xenotarsosaurus

Rahiolisaurus

Dahalokely

Thanos shared only two synapomorphies with the Brachyrostra. The front articular facet of the axis is more than twice as high as the rear articular facet. The rear facet is inclined to the front under an angle of less than 75°.[1]

Paleoecology[edit]

Thanos shared its environment with an undescribed larger theropod believed to be a megaraptoran of which a vertebra, specimen MPMA 08–0003/94, has been found at Ibirá. This would imply that Thanos was not the apex predator of its habitat.[1]

References[edit]

  1. ^ a b c d e f g h i Delcourt, Rafael; Vidoi Iori, Fabiano (2018). "A new Abelisauridae (Dinosauria: Theropoda) from São José do Rio Preto Formation, Upper Cretaceous of Brazil and comments on the Bauru Group fauna". Historical Biology: 1–8. doi:10.1080/08912963.2018.1546700.
  2. ^ Méndez A.H., Novas F.E., Iori F.V. 2014. "New record of abelisauroid theropods from the Bauru Group (Upper Cretaceous), São Paulo State, Brazil". Revista Brasileira de Paleontologia. 17(1): 23–32