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The Mesozoic Radiation of Birds

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The Mesozoic Radiation of Birds 19 Oct 2002 14:52 AR AR173-ES33-05.tex AR173-ES33-05.SGM LaTeX2e(2002/01/18) P1: IBC 10.1146/annurev.ecolsys.33.010802.150517 Annu. Rev. Ecol. Sys. 2002. 33:91–124 doi: 10.1146/annurev.ecolsys.33.010802.150517 Copyright c 2002 by Annual Reviews. All rights reserved First published online as a Review in Advance on August 6, 2002 THE MESOZOIC RADIATION OF BIRDS Luis M. Chiappe1 and Gareth J. Dyke2 1Department of Vertebrate Paleontology, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007; email: [email protected] 2Division of Vertebrate Zoology (Ornithology), American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024; email: [email protected] Key Words birds, Mesozoic, origin, evolution, extinction, aves, flight, feathers, phylogeny ■ Abstract Until recently, most knowledge of the early history of birds and the evolution of their unique specializations was based on just a handful of diverse Meso- zoic taxa widely separated in time and restricted to marine environments. Although Archaeopteryx is still the oldest and only Jurassic bird, a wealth of recent discoveries combined with new phylogenetic analyses have documented the divergence of a number of lineages by the beginning of the Cretaceous. These and younger Cretaceous fossils have filled much of the morphological chasm that existed between Archaeopteryx and its living counterparts, providing insights into the evolutionary development of feathers and other important features of the avian flight system. Dramatic new perceptions of the life history, growth and development of early birds have also been made possible by the latest data. Although no primitive birds are known to have survived beyond the end of the Cretaceous, the present fossil record provides no evidence for a sudden disappearance. Likewise, a Mesozoic origin for extant birds remains controversial. INTRODUCTION Birds are the most speciose group of land vertebrates. Today’s 10,000 species are the extant members of an ancient radiation that can be traced back 150 million by UNIVERSITY OF ILLINOIS - CHICAGO on 06/10/08. For personal use only. years, to the famous Archaeopteryx lithographica from the Late Jurassic Solnhofen Annu. Rev. Ecol. Syst. 2002.33:91-124. Downloaded from arjournals.annualreviews.org limestones of Germany. The taxonomic diversity and genealogical relationships of early birds, the origin and refinement of flight, the timing of divergence of extant lineages, and the origin of avian functional and physiological specializations are just some of the evolutionary issues that have captured the interest of decades of paleoornithological research. For most of this time, evidence for investigating these issues was limited to a small number of fossils greatly separated both temporarily and morphologically, and largely restricted to near-shore and marine environments. This situation has continued to change over the past two decades, as increasing discoveries of Cretaceous birds have begun to reveal an unexpected diversity of lineages (Figure 1). The number of new species of Mesozoic birds discovered and described over the past 10 years more than triples those known for much of the past 0066-4162/02/1215-0091$14.00 91 19 Oct 2002 14:52 AR AR173-ES33-05.tex AR173-ES33-05.SGM LaTeX2e(2002/01/18) P1: IBC 92 CHIAPPE DYKE Figure 1 Descriptions of non-neornithine bird genera over time. Note the steep increment of new discoveries during the past two decades. two centuries (Table 1). This burst of fossil discoveries has been summarized in a number of recent publications (Chiappe 1995, Chatterjee 1997, Padian & Chiappe 1998, Feduccia 1999). Although essentially examining the same fossil record, these studies reveal a variety of interpretations resulting from different methodological approaches to reconstructing phylogeny. Our review is one guided by the principles of phylogenetic systematics. ORIGINS The origin of birds—Aves, the clade including the last common ancestor of Archaeopteryx and living birds—has been the subject of debate almost since by UNIVERSITY OF ILLINOIS - CHICAGO on 06/10/08. For personal use only. the advent of evolutionary thought. Historical proposals for the ancestry of birds Annu. Rev. Ecol. Syst. 2002.33:91-124. Downloaded from arjournals.annualreviews.org have included turtles, lizards, crocodylomorphs, and pterosaurs, as well as both ornithischian and theropod dinosaurs (Witmer 1991, Padian & Chiappe 1998). Today, in spite of a few remaining and poorly substantiated hypotheses identi- fying crocodiles (Martin 1983, Martin et al. 1980, Martin & Stewart 1999) or a variety of basal archosauromorphs (Feduccia & Wild 1993, Welman 1995) as birds’ closest relatives, most researchers agree that birds are theropod dinosaurs (Chatterjee 1997, Chiappe 2001, Gauthier & Gall 2001). Although this idea had its roots in the nineteenth century, modern hypotheses stem from the detailed work of J. Ostrom (1969, 1973, 1976). Since then, a wealth of osteological evi- dence has accumulated in support of Ostrom’s hypothesis that birds originated within small and predominantly terrestrial coelurosaurian theropods (Ostrom 1976; 19 Oct 2002 14:52 AR AR173-ES33-05.tex AR173-ES33-05.SGM LaTeX2e(2002/01/18) TABLE 1 Described genera of Mesozoic birds (those of questionable validity are not listed). Enviroment and year refer to the depositional environment and year of original description, respectively; taxonomic position of Rahonavis ostromi follows Forster et al. 1998a Genera Clade Stratigraphic age Material Environment Distribution Year Archaeopteryx Archaeopterygidae L. Jurassic Several specimens Near shore Germany 1861 Rahonavis Archaeopterygidae L. Cretaceous Single specimen Inland Madagascar 1998 Confuciusornis Confuciusornithidae E. Cretaceous Many specimens Inland China 1995 Changchengornis Confuciusornithidae E. Cretaceous Single specimen Inland China 1999 Nanantius Enantiornithes E. Cretaceous Isolated bones Near shore Australia 1986 by UNIVERSITY OF ILLINOIS - CHICAGO on 06/10/08. For personal use only. Annu. Rev. Ecol. Syst. 2002.33:91-124. Downloaded from arjournals.annualreviews.org Noguerornis Enantiornithes E. Cretaceous Single specimen Inland Spain 1989 Iberomesornis Enantiornithes E. Cretaceous Single specimen Inland Spain 1992 Sinornis Enantiornithes E. Cretaceous Several specimens Inland China 1992 Otogornis Enantiornithes E. Cretaceous Single specimen Inland China 1994 MESOZOIC RADIATION OF BIRDS Boluochia Enantiornithes E. Cretaceous Single specimen Inland China 1995 Concornis Enantiornithes E. Cretaceous Single specimen Inland Spain 1995 Eoalulavis Enantiornithes E. Cretaceous Single specimen Inland Spain 1996 Eoenantiornis Enantiornithes E. Cretaceous Single specimen Inland China 1999 Protopteryx Enantiornithes E. Cretaceous Single specimen Inland China 2000 Gobipteryx Enantiornithes L. Cretaceous Several specimens Inland Mongolia 1974 Alexornis Enantiornithes L. Cretaceous Isolated bones Inland Mexico 1976 Enantiornis Enantiornithes L. Cretaceous Isolated bones Inland Argentina 1981 Avisaurus Enantiornithes L. Cretaceous Isolated bones Inland USA 1985 Soroavisaurus Enantiornithes L. Cretaceous Isolated bones Inland Argentina 1993 P1: IBC Yungavolucris Enantiornithes L. Cretaceous Isolated bones Inland Argentina 1993 93 (Continued) 19 Oct 2002 14:52 AR AR173-ES33-05.tex AR173-ES33-05.SGM LaTeX2e(2002/01/18) TABLE 1 (Continued) 94 Genera Clade Stratigraphic age Material Environment Distribution Year CHIAPPE Lectavis Enantiornithes L. Cretaceous Isolated bones Inland Argentina 1993 Neuquenornis Enantiornithes L. Cretaceous Single specimen Inland Argentina 1994 Halimornis Enantiornithes L. Cretaceous Single specimen Offshore USA 2002 Enaliornis Ornithuromorpha E. Cretaceous Isolated bones Offshore UK 1876 DYKE Ambiortus Ornithuromorpha E. Cretaceous Single specimen Inland Mongolia 1982 Gansus Ornithuromorpha E. Cretaceous Single specimen Inland China 1984 by UNIVERSITY OF ILLINOIS - CHICAGO on 06/10/08. For personal use only. Longipteryx Ornithuromorpha E. Cretaceous Single specimen Inland China 2001 Annu. Rev. Ecol. Syst. 2002.33:91-124. Downloaded from arjournals.annualreviews.org Yanornis Ornithuromorpha E. Cretaceous Single specimen Inland China 2001 Yixianornis Ornithuromorpha E. Cretaceous Single specimen Inland China 2001 Hesperornis Ornithuromorpha L. Cretaceous Many specimens Offshore USA/Canada 1872 Ichthyornis Ornithuromorpha L. Cretaceous Many specimens Offshore USA/Canada 1872 Apatornis Ornithuromorpha L. Cretaceous Single specimen Offshore USA 1876 Baptornis Ornithuromorpha L. Cretaceous Several specimens Offshore USA/Canada 1877 Parahesperornis Ornithuromorpha L. Cretaceous Single specimen Offshore USA 1984 Patagopteryx Ornithuromorpha L. Cretaceous Several specimens Inland Argentina 1992 Vorona Ornithuromorpha L. Cretaceous Single specimen Inland Madagascar 1996 Limenavis Ornithuromorpha L. Cretaceous Single specimen Inland Argentina 2001 Apsaravis Ornithuromorpha L. Cretaceous Single specimen Inland Mongolia 2001 Chaoyangia Controversial status E. Cretaceous Single specimen Inland China 1995 Liaoningornis Controversial status E. Cretaceous Single specimen Inland China 1996 Sapeornis Controversial status E. Cretaceous Single specimen Inland China 2002 P1: IBC Abbreviations: E., Early; L., Late. 19 Oct 2002 14:52 AR AR173-ES33-05.tex AR173-ES33-05.SGM LaTeX2e(2002/01/18) P1: IBC MESOZOIC RADIATION OF BIRDS 95 Figure 2 Reconstructions of the dromaeosaurid Velociraptor mongoliensis (left; after Paul
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