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 Aucasaurus garridoi

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PostSubject: Aucasaurus garridoi   Wed Oct 26, 2016 5:20 pm

Aucasaurus garridoi



Temporal range: Late Cretaceous, 83 Ma

Scientific Classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Saurischia
Suborder: Theropoda
Family: Abelisauridae
Subfamily: Carnotaurinae
Sub-clade: Brachyrostra
Tribe: Carnotaurini
Genus: Aucasaurus
Species: Aucasaurus garridoi

Aucasaurus is a medium sized Abelisurid theropod, from the Auca Mahuevo (Argentina) bonebed from which its name is derived. It has larger arms than Carnotaurus sastrei, and does not have claws. The metacarpals are fused into the Tibia and ulna, the tibia itself is only 33% the size of its humerus.

Aucasaurus garridoi is known from a single, relatively complete skeleton from Auca Mahuevo in the Anacleto formation. The etymology of the name Aucasaurus is as follows.

'Auca' comes from the Auca Mahuevo bonebed from which it was discovered. 'Saurus' comes from the greek word for lizard or reptile. Garridoi refers to the man who discovered the holotype. Alberto Garrido.

The skull is more remniscent of less derived theropods than that of Carnotaurus. It is more boxlike, and is larger in proportion to its body. However it has large swells above the eyes. A feature it shares with more specialized Carnotaurus, however it doesn't possess the lacrimal/prefrontal horns which it is portrayed with on Dinosaur Planet.

In 2016, its length was estimated as 6.1 metres (20 ft). Gregory S. Paul had previously estimated its weight at 700 kg. Smaller than Carnotaurus, but it retains several features which Carnotaurus does not. Nevertheless, the two share a large number of features. While the shape of the skull is unmistakably different from Carnotaurus, the general anatomy is reasonably similar. And the shape is one of the few things that actually sets it apart from Carnotaurus. It is different enough from Carnotaurus to have its own genus, however, they have been grouped together due their similarities in a tribe known as Carnotaurini.

Carnotaurini is defined as 'The last common ancestor of Carnotaurus and Aucasaurus and all descendants of that ancestor'
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