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Austrocheirus

Temporal range: Late Cretaceous, 96.2 MaPreЄ

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Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauria
Order: Saurischia
Suborder: Theropoda
Genus: Austrocheirus

Ezcurra et al.,2010

Species: A. isasii
Binomial name
Austrocheirus isasii

Ezcurra et al., 2010

Austrocheirus is an extinct genus oftheropod dinosaur, possibly aneoceratosaurian, which existed during the late Cretaceous period. It was named and described by Martín Ezcurra,Federico Agnolin and Fernando Novasin 2010. It contains the type speciesAustrocheirus isasii. The generic name means "southern hand". The specific epithet honours discoverer and preparator Marcelo Pablo Isasi.[1]

The fossils were found on 17 March 2002 in the Pari Aike Formation, which was originally dated to theMaastrichtian, around 71 to 66 million years ago, but was more recently dated to the Cenomanian, around 96.2 million years ago.[2] These fossils consist of a partial manus (hand), a tibia, axial bones, and a foot bone.[1]

In 2016, its length was estimated to be 5.5 metres (18 ft).[3]

A cladistic analysis indicatedAustrocheirus had a basal position in theAbelisauroidea, but was more derived than Ceratosaurus and Berberosaurus. This would make it the first known mid-sized abelisauroid which did not possess the reduced forelimbs seen in other members of that clade.[1]

The referral of Austrocheirus to Abelisauroidea was challenged by Oliver Rauhut (2012), who claimed that the putative abelisauroid synapomorphies used to justify this referral are actually also present in the skeletons of non-abelisauroid theropods. Thus, according to RauhutAustrocheirus can be only classified as a theropod dinosaur of uncertain phylogenetic placement.[4]

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