A new clade of archaic large-bodied predatory dinosaurs (Theropoda: Allosauroidea) that survived to the latest Mesozoic (original) (raw)

Abstract

Non-avian theropod dinosaurs attained large body sizes, monopolising terrestrial apex predator niches in the Jurassic–Cretaceous. From the Middle Jurassic onwards, Allosauroidea and Megalosauroidea comprised almost all large-bodied predators for 85 million years. Despite their enormous success, however, they are usually considered absent from terminal Cretaceous ecosystems, replaced by tyrannosaurids and abelisaurids. We demonstrate that the problematic allosauroids Aerosteon, Australovenator, Fukuiraptor and Neovenator form a previously unrecognised but ecologically diverse and globally distributed clade (Neovenatoridae, new clade) with the hitherto enigmatic theropods Chilantaisaurus, Megaraptor and the Maastrichtian Orkoraptor. This refutes the notion that allosauroid extinction pre-dated the end of the Mesozoic. Neovenatoridae includes a derived group (Megaraptora, new clade) that developed long, raptorial forelimbs, cursorial hind limbs, appendicular pneumaticity and small size, features acquired convergently in bird-line theropods. Neovenatorids thus occupied a 14-fold adult size range from 175 kg (Fukuiraptor) to approximately 2,500 kg (Chilantaisaurus). Recognition of this major allosauroid radiation has implications for Gondwanan paleobiogeography: The distribution of early Cretaceous allosauroids does not strongly support the vicariant hypothesis of southern dinosaur evolution or any particular continental breakup sequence or dispersal scenario. Instead, clades were nearly cosmopolitan in their early history, and later distributions are explained by sampling failure or local extinction.

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Acknowledgements

SLB is supported by an NSF Graduate Research Fellowship at Columbia University. Specimen visits central to this study were funded by the Palaeontographical Society and the Jurassic Foundation. We thank numerous curators and researchers for access to specimens in their care, primarily J. Calvo, S. Chapman, S. Hutt, R. Masek, P.C. Sereno and X. Xu.

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Authors and Affiliations

1. Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK
   Roger B. J. Benson
2. Department of Paleobiology, Smithsonian Institution, P.O. Box 37012, MRC 121, Washington, DC, 20013-7012, USA
   Matthew T. Carrano
3. Division of Paleontology, American Museum of Natural History, Central Park West at 79th Street, New York, NY, 10024, USA
   Stephen L. Brusatte
4. Department of Earth and Environmental Sciences, Columbia University, New York, NY, USA
   Stephen L. Brusatte

Authors

1. Roger B. J. Benson
2. Matthew T. Carrano
3. Stephen L. Brusatte

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Correspondence toRoger B. J. Benson.

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Benson, R.B.J., Carrano, M.T. & Brusatte, S.L. A new clade of archaic large-bodied predatory dinosaurs (Theropoda: Allosauroidea) that survived to the latest Mesozoic.Naturwissenschaften 97, 71–78 (2010). https://doi.org/10.1007/s00114-009-0614-x

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• Received: 26 August 2009
• Revised: 27 September 2009
• Accepted: 29 September 2009
• Published: 14 October 2009
• Issue Date: January 2010
• DOI: https://doi.org/10.1007/s00114-009-0614-x

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