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First ceratosaurian dinosaur from Australia.

Erich M G Fitzgerald¹, Matthew T Carrano, Timothy Holland

¹Museum Victoria, GPO Box 666, Melbourne, Victoria, 3001, Australia. efitzgerald@museum.vic.gov.au

Die Naturwissenschaften

|May 4, 2012

Summary

The discovery of a new dinosaur fossil in Australia provides the first evidence of Ceratosauria, a basal theropod group, in eastern Gondwana. This finding highlights Australia’s diverse, cosmopolitan dinosaur fauna during the Early Cretaceous.

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Area of Science:

Paleontology
Vertebrate Paleontology
Mesozoic Era Paleontology

Background:

Ceratosauria and Abelisauroidea are key theropod clades in late Mesozoic western Gondwana and Europe.
Australia's theropod record previously lacked clear ceratosaur evidence, featuring Laurasian clades instead.

Purpose of the Study:

To report the first definitive evidence of Ceratosauria in eastern Gondwana.
To investigate the composition and biogeographic implications of Australia's Early Cretaceous theropod fauna.

Main Methods:

Paleontological analysis of a diagnostic astragalocalcaneum fossil.
Stratigraphic dating of the fossil-bearing layer to the Aptian stage (121-125 Ma).

Main Results:

Identification of a ceratosaurian (potentially abelisauroid) astragalocalcaneum from Victoria, Australia.
Confirmation of Ceratosauria's presence in both western and eastern Gondwana during the Early Cretaceous.
Demonstration of a cosmopolitan theropod fauna in mid-Cretaceous Australia, including Gondwanan and Laurasian clades.

Conclusions:

The Australian theropod fauna was more cosmopolitan than previously assumed, challenging notions of Gondwanan or Laurasian dominance.
Early global distribution of theropod clades, predating significant continental breakup, likely explains Australia's diverse fauna.
This finding contributes significantly to the understanding of Australia's poorly known dinosaur fauna.