The teeth of the unenlagiine theropod Buitreraptor from the Cretaceous of Patagonia, Argentina, and the unusual dentition of the Gondwanan dromaeosaurids

• Autorzy: Gianechini F.A. , Makovicky P. J. , Apesteguia S.
• Języki publikacji: EN

Abstrakty

EN

The Unenlagiinae is a clade of Gondwanan dromaeosaurid theropods mainly known from incomplete skeletal material. The group includes two recently discovered theropods, Buitreraptor and Austroraptor, from which cranial remains are available with in situ maxillary and dentary teeth, thus allowing the study of tooth morphology. Among the derived traits that diagnose the dentition of unenlagiines are: (i) high tooth count, (ii) small size of individual teeth when compared with skull height, (iii) absence of denticles and carinae, and (iv) presence of longitudinal grooves on the tooth crown. This suite of dental characteristics, shared between Buitreraptor and Austroraptor, can be considered as diagnostic of the Unenlagiinae or, at least, a more exclusive clade within the group. The teeth of Buitreraptor exhibit a remarkable labiolingual compression, whereas Austroraptor possesses more conical teeth, probably respective autapomorphic features. On one hand, these dental morphologies differ from those observed in most Laurasian dromaeosaurids and, for instance, could be considered as further proof of the purported vicariant evolution of the lineage on the southern continents. On the other hand, the morphological similarities (e.g., absence of denticles) between the teeth of unenlagiines and other theropod lineages, including Mesozoic birds and ornithomimosaurs, can be considered as the result of parallel trends related to dental reduction.

Słowa kluczowe

EN

tooth; unenlagiine theropod; theropod; Buitreraptor; Cretaceous; Patagonia; Argentina; dentition; Gondwanan dromaeosaurid; dromaeosaurid; Theropoda; Dromaeosauridae; Unenlagiinae; Dinosauria; paleontology; dinisaur tooth

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2011
• Tom: 56
• Numer: 2
• Opis fizyczny: p.279-290,fig.,ref.

Twórcy

autor

Gianechini F.A.

• CONICET, Fundacion de Historia Natural “Felix de Azara” – CEBBAD – Universidad Maimonides. Hidalgo 775, 7 piso (1405BDB), Buenos Aires, Argentina

autor

Makovicky P. J.

autor

Apesteguia S.

Bibliografia

• Allain, R. and Taquet, P. 2000. A new genus of dromaeosaurid (Dinosauria, Theropoda) from the Upper Cretaceous of France. Journal of Vertebrate Paleontology 20: 404–407.
• Amiot, R., Buffetaut, E., Tong, H., Boudad, L., and Kabiri, L. 2004. Isolated theropod teeth from the Cenomanian of Morocco and their palaebiogeographical significance. Revue de Paléobiologie, Volumen Spécial 9: 143–149.
• Antunes, M.T. and Sigogneau, D. 1992. La faune de petits dinosaures du Crétacé Terminal Portugais.Comunicações dos Serviços Geológicos de Portugal 78: 49–62.
• Apesteguía, S., Agnolín, F.L., and Claeson, K. 2007. Review of Cretaceous dipnoans from Argentina (Sarcopterygii: Dipnoi) with descriptions of new species. Revista del Museo Argentino de Ciencias Naturales, New Series 9: 27–40.
• Averianov, A.O. and Sues, H.−D. 2007. A new troodontid (Dinosauria: Theropoda) from the Cemomanian of Uzbekistan, with a review of troodontid records from the territories of the former Soviet Union. Journal of Vertebrate Paleontology 27: 87–98.
• Balanoff, A.M., Xu, X., Kobayashi, Y., Matsufune, Y., and Norell, M.A. 2009. Cranial osteology of the theropod dinosaurIncisivosaurus gauthieri (Theropoda: Oviraptorosauria). American Museum Novitates 3651: 1–35.
• Bonaparte, J.F. 1999. Tetrapod faunas from South America and India; a palaeobiogeographic interpretation. In: Gondwana Assembly; New Issues and Perspectives. Proceedings of the Indian National Science Academy, Part A: Physical Sciences 65: 427–437.
• Burnham, D.A. 2004. New information on Bambiraptor feinbergi (Theropoda: Dromaeosauridae) from the Late Cretaceous of Montana. In: P.J. Currie, E.B. Koppelhus, M.A. Shugar, and J.L. Wright (eds.), Feathered Dinosaurs, 67–111. Indiana University Press, Bloomington.
• Calvo, J.O., Pofiri, J.D., and Kellner, A.W.A. 2004. On a new maniraptoran dinosaur (Theropoda) from the Upper Cretaceous of Neuquén, Patagonia, Argentina.Arquivos do Museu Nacional do Rio de Janeiro 62: 549–566.
• Canale, J.I., Novas, F.E., and Simón, M.E. 2005. Dientes de terópodos de la Formación Huincul (Turoniano inferior), provincia de Neuquén, Argentina. Ameghiniana 42 (Suplemento 4): 63R.
• Canale, J.I., Agnolin, F.L., Ezcurra, M.D., and Novas, F.E. 2007. Notas sobre el registro de dientes aislados de dinosaurios terópodos cretácicos de América del Sur. Ameghiniana 44 (Suplemento 4): 8R.
• Candeiro, C.R.A., Martinelli, A.G., Avilla, L.S. and Rich, T.H. 2006. Tetrapods from the Upper Cretaceous (Turonian–Maastrichtian) Bauru Group of Brazil: a reappraisal. Cretaceous Research 27: 923–946.
• Canudo, J.I., Salgado, L., Barco, J.L., Bolatti, R., and Ruiz−Omeñaca, J.I. 2004. Dientes de dinosaurios terópodos y saurópodos de la Formación Cerro Lisandro (Cenomaniense superior–Turoniense inferior, Cretácico superior) en Río Negro (Argentina). Geotemas 6: 31–34.
• Casal, G., Candeiro, C.R.A, Martínez, R., Ivany, E., and Ibirucu, L. 2009. Dientes de Theropoda (Dinosauria: Saurischia) de la Formación Bajo Barreal, Cretácico Superior, Provincia del Chubut, Argentina. Geobios 42: 553–560.
• Chiappe, L.M. and Walker, C.A. 2002. Skeletal morphology and systematics of the Cretaceous Euenantiornithes (Ornithothoraces: Enantiornithes). In: L.M. Chiappe and L.M. Witmer (eds.), Mesozoic Birds, Above the Heads of Dinosaurs, 240–267. University of California Press, Berkeley.
• Chiappe, L.M., Norell, M.A., and Clark, J.M. 1998. The skull of a relative of the stem−bird group Mononykus. Nature 392: 275–278.
• Clark, J.M., Perle, A., and Norell, M.A. 1994. The skull of Erlicosaurus andrewsi, a Late Cretaceous “segnosaur” (Theropoda: Therizinosauridae) from Mongolia. American Museum Novitates 3115: 1–39.
• Colbert, E.H. and Russel, D.A. 1969. The small cretaceous dinosaur Dromaeosaurus. American Museum Novitates 2380: 1–49.
• Corbella, H., Novas, F.E., Apesteguía, S., and Leanza, H.A. 2004. First fission−track for the dinosaur−bearing Neuquén Group (Upper Cretaceous), Neuquén Basin, Argentina. Revista del Museo Argentino de Ciencias Naturales NS 6: 227–232.
• Coria, R.A. and Currie, P.J. 2006. A new carcharodontosaurid (Dinosauria, Theropoda) from the Upper Cretaceous of Argentina. Geodiversitas 28: 71–118.
• Currie, P.J. 1995. New information of the anatomy and relationships of Dromaeosaurus albertensis(Dinosauria: Theropoda). Journal of Vertebrate Paleontology 15: 576–591.
• Currie, P.J. and Chen, P.J. 2001. Anatomy of Sinosauropteryx prima from Liaoning, northeastern China. Canadian Journal of Earth Sciences 38: 1705–1727.
• Currie, P.J. and Dong, Z.−M. 2001. New information on Cretaceous troodontids (Dinosauria, Theropoda) from the People’s Republic of China. Canadian Journal of Earth Sciences 38: 1753–1766.
• Currie, P.J. and Varricchio, D.J. 2004. A new dromaeosaurid from the Horseshoe Canyon Formation (Upper Cretaceous) of Alberta, Canada. In: P.J. Currie, E.B. Koppelhus, and M.A. Shugar (eds.), Feathered Dragons: Studies from the Transition from Dinosaurs to Birds, 113–132. Indiana University Press, Bloomington.
• Currie, P.J., Rigby, J.K. Jr, and Sloan, R.E. 1990. Theropod teeth from the Judith River Formation of southern Alberta, Canada. In: K. Carpenter and P. Currie (eds.), Dinosaur Systematics: Perspectives and Approaches, 107–125. Cambridge University Press, Cambridge.
• De Valais, S., Apesteguía, S., and Udrizar Sauthier, D. 2003. Nuevas evidencias de dinosaurios de la Formación Puerto Yeruá (Cretácico), Provincia de Entre Ríos, Argentina. Ameghiniana 40: 631–635.
• Elias, F.A., Bertini, R.J., and Medeiros, M.A. 2004. Nota preliminar sobre novos morfótipos de dentes tetrapodianos, coletados na Laje do Coringa, Formação Alcântara, Eo−Cenomaniano do norte do Estado do Maranhão. IV Simposio Brasileiro de Paleontología de Vertebrados, Boletim de Resumos: 21–22.
• Elias, F.A., Bertini, R.J., and Medeiros, M.A. 2005. Review of the occurrences concerning isolated amniotes teeth, in the Cretaceous deposits from the Maranhão State. II Congreso Latino−Americano de Paleontología de Vertebrados, Boletim de Resumos: 99–100.
• Elias, F.A., Bertini, R.J., and Medeiros, M.A. 2006. A diversidade de amniotas do afloramento “Laje do Coringa”, Formação Alcântara, Eo−Cenomaniano do Estado do Maranhão. Inferências com base em registro dentário. In: Boletim do 7 Simpósio do Cretáceo do Brasil/1 Simposio do Terciário do Brasil, 46. Serra Negra.
• Elias, F.A., Bertini, R.J., and Medeiros, M.A.A. 2007. Velociraptorinae (Maniraptoriformes) teeth from the Coringa Flagstoen outcrop, Middle Cretaceous of the Sao Luis−Grajau Basin, Maranhao State, Northern−Northeastern Brazil. In: I. de S. Carvalho, R. de C.T. Cassab, C. Schwanke, M. de A. Carvalho, A.C.S. Fernandes, M.A. da C. Rodrigues, M.S.S. de Carvalho, M. Arai, and M.E.Q. Oliveira (eds.), Paleontologia: Cenarios de Vida, 307–317. Editora Interciência, Rio de Janeiro.
• Elzanowski, A. and Wellnhofer, P. 1996. Cranial morphology of Archaeopteryx: evidence from the seventh skeleton. Journal of Vertebrate Paleontology 16: 81–94.
• Ezcurra, M.D. 2009. Theropod remains from the uppermost Cretaceous of Colombia and their implications for the palaeozoogeography of western Gondwana. Cretaceous Research 30: 1339–1344.
• Fanti, F. and Therrien, F. 2007. Theropod tooth assemblages from the Late Cretaceous Maevarano Formation and the possible presence of dromaeosaurids in Madagascar. Acta Palaeontologica Polonica 52: 155–166.
• Feduccia, A. 2002. Birds are dinosaurs: simple answer to a complex question. The Auk 119: 1187–1201.
• Forster, C.A., Sampson, S.D., Chiappe, L.M., and Krause, D.W. 1998. The theropod ancestry of birds: new evidence from the Late Cretaceous of Madagascar. Science 279: 1915–1919.
• Galton, P.M. and Taquet, P. 1982. Valdosaurus, a hypsilophodontid dinosaur from the Lower Cretaceous of Europe and Africa.Geobios 15: 147–159.
• Gianechini, F.A., Apesteguía, S., and Makovicky, P.J. 2009. The unusual dentiton of Buitreraptor gonzalezorum (Theropoda: Dromaeosauridae), from Patagonia, Argentina: new insights on the unenlagine teeth. Ameghiniana 46 (Suplemento 4): 29R.
• Hwang, S.H. 2005. Phylogenetic patterns of enamel microstructure in dinosaur teeth. Journal of Morphology 266: 208–240.
• Hwang, S.H., Norell, M.A., Qiang, J., and Keqin, G. 2002. New specimens of Microraptor zhaoianus (Theropoda: Dromaeosauridae) from Northeastern China. American Museum Novitates 3381: 1–44.
• Hwang, S.H., Norell, M.A., Qiang, J., and Keqin, G. 2004. A large compsognathid from the Early Cretaceous Yixian Formation of China. Journal of Systematic Paleontology 2: 13–30.
• Ji, Q., Norell, M.A., Makovicky, P.J., Gao, K−Q., Ji, S., and Yuan, C. 2003. An early ostrich dinosaur and implications for ornithomimosaur phylogeny. American Museum Novitates 3420: 1–19.
• Kirkland, J.I. and Wolfe, D.G. 2001. First definitive therizinosaurid (Dinosauria; Theropoda) from North America. Journal of Vertebrate Paleontology 21: 410–414.
• Knoll, F. and Ruiz−Omeñaca, J.I. 2009. Theropod teeth from the basalmost Cretaceous of Anoual (Morocco) and their palaeobiogeographical significance. Geological Magazine 146: 602–616.
• Lubbe, T. van der, Richter, U., and Knötschke, N. 2009. Velociraptorine dromaeosaurid teeth from the Kimmeridgian (Late Jurassic) of Germany. Acta Palaeontologica Polonica 54: 401–408.
• Madsen, J.H. and Welles, S.P. 2000. Ceratosaurus (Dinosauria, Theropoda) a revised osteology. Utah Geological Survey Miscellaneous Publication 00−2: 1–80.
• Makovicky, P.J. and Norell, M.A. 2004. Troodontidae. In: D.B. Weishampel, P. Dodson, and H. Osmólska (eds.), The Dinosauria, 184–195. University of California Press, Berkeley.
• Makovicky, P.J., Norell, M.A., Clark, J.M., and Rowe, T. 2003. Osteology and relationships of Byronosaurus jaffei (Theropoda: Troodontidae). American Museum Novitates 3402: 1–32.
• Makovicky, P.J., Kobayashi, Y., and Currie, P.J. 2004. Ornithomimosauria. In: D.B. Weishampel, P. Dodson, and H. Osmólska (eds.), The Dinosauria, 137–150. University of California Press, Berkeley.
• Makovicky, P.J., Apesteguía, S., and Agnolín, F.L. 2005. The earliest dromaeosaurid theropod from South America.Nature 437: 1007–1011.
• Martin, L.D. and Stewart, J.D. 1977. Teeth in Ichthyornis(class: Aves). Science 195: 1331–1332.
• Martin, L.D. and Zhou, Z.−H. 1997. Archaeopteryx−like skull in Enantiornithine bird. Nature 389: 556.
• Martin, L.D., Stewart, J.D., and Whetstone, K.N. 1980. The origins of birds: structure of the tarsus and teeth. The Auk 97: 86–93.
• Milner, A.R. and Norman, D.B. 1984. The biogeography of advanced ornithopod dinosaurs (Archosauria: Ornithischia)—a cladistic−vicariance model.
• In: W.−W. Reif and E. Westphal (eds.), Third Sympium of Mesozoic Terrestrial Ecosystems, Short Papers, 145–150. Attempto−Verlag, Tübingen.
• Norell, M.A. and Makovicky, P.J. 2004. Dromaeosauridae. In: D.B. Weishampel, P. Dodson, and H. Osmólska (eds.), The Dinosauria, 196–209. University of California Press, Berkeley.
• Norell, M.A., Makovicky, P.J., and Clark, J.M. 2000. A new troodontid theropod from Ukhaa Tolgod, Mongolia. Journal of Vertebrate Paleontology 20: 7–11.
• Norell, M.A., Clark, J.M., Turner, A.H., Makovicky, P.J., Barsbold, R., and Rowe, T. 2006. A New Dromaeosaurid Theropod from Ukhaa Tolgod (Ömnögov, Mongolia). American Museum Novitates 3545: 1–51.
• Novas, F.E. and Puerta, P.F. 1997. New evidence concerning avian origins from the Late Cretaceous of Patagonia. Nature 387: 390–392.
• Novas, F.E. and Pol, D. 2005. New evidence on deinonychosaurian dinosaurs from the Late Cretaceous of Patagonia. Nature 433: 858–861.
• Novas, F.E., Ezcurra, M.D., and Lecuona, A. 2008. Orkoraptor burkei nov. gen. et nov. sp., a large basal coelurosaurian theropod from the Maastrichtian Pari Aike Formation, Southern Patagonia, Argentina. Cretaceous Research 29: 468–480.
• Novas, F.E., Pol, D., Canale, J.I., Porfiri, J.D., and Calvo, J.O. 2009. A bizarre Cretaceous theropod dinosaur from Patagonia and the evolution of Gondwanan dromaeosaurids. Proceedings of the Royal Society B 276: 1101–1107.
• Ösi, A., Apesteguía, S., and Kowalewski, M. 2010. Non−avian theropod dinosaurs from the early Late Cretaceous of central Europe. Cretaceous Research 31: 304–320.
• Ostrom, J.H. 1969. Osteology of Deinonychus antirrhopus, an unusual theropod from the Lower Cretaceous of Montana. Bulletin of the Peabody Museum of Natural History 30: 1–165.
• Ostrom, J.H. 1978. The osteology of Compsognathus longipes Wagner. Zitteliana 4: 73–118.
• Padian, K. 2004. Basal Avialae. In: D.B. Weishampel, P. Dodson, and H. Osmólska (eds.), The Dinosauria, 210–231. University of California Press, Berkeley.
• Pérez−Moreno, B.P., Sanz, J.L., Buscalioni, A.D., Moratalla, J.J., Ortega, F., and Rasskin−Gutman, D. 1994. A unique multitoothed ornithomimosaur from the Lower Cretaceous of Spain. Nature 370: 363–367.
• Perle, A., Chiappe, L.M., Barsbold, R., Clark, J.M., and Norell, M.A. 1994. Skeletal morphology of Mononykus olecranus (Theropoda: Avialae) from the Late Cretaceous of Mongolia. American Museum Novitates 3105: 1–29.
• Perle, A., Norell, M.A., Chiappe, L.M., Clark, J. 1993a. Flightless bird from the Cretaceous of Mongolia. Nature 362: 623–626.
• Perle, A., Norell, M.A., Chiappe, L.M., and Clark, J. 1993b. Correction to flightless bird from the Cretaceous of Mongolia.Nature 362: 623–628.
• Poblete, F. and Calvo, J.O. 2003. Upper Turonian dromaeosaurid teeth from Futalognko quarry, Barreales Lake, Neuquén, Patagonia, Argentina. XIX Jornadas Argentinas de Paleontología de Vertebrados, Resúmenes: 24.
• Rauhut, O.W.M. 1999. A dinosaur fauna from the Late Cretaceous (Cenomanian) of northern Sudan. Palaeontologia Africana 35: 61–84.
• Rauhut, O.W.M. 2002. Dinosaur teeth from the Barremian of Uña, Province of Cuenca, Spain. Cretaceous Research 23: 255–263.
• Rauhut, O.W.M. and Werner, C. 1995. First record of the family Dromaeosauridae (Dinosauria: Theropoda) in the Cretaceous of Gondwana (Wadi Milk Formation, northern Sudan). Paläontologische Zeitschrift 69: 475–489.
• Ruiz−Omeñaca, J.I., Canudo, J.I., and Cuenca−Bescós, G. 1996. Dientes de dinosaurios (Ornitischia y Saurischia) del Barremiense superior (Cretácico inferior) de Vallipón (Castellote, Teruel). Mas de las Matas 15: 29–103.
• Russel, D.A. and Dong, Z.−M. 1993. A nearly complete skeleton of a new troodontid from the Early Cretaceous of the Ordos Basin, Inner Mongolia, People’s Republic of China. Canadian Journal of Earth Sciences 30: 2163–2173.
• Salgado, L., Canudo, J.I., Garrido, A.C., Ruiz−Omeñaca, J.I., García, R.A., de la Fuente, M.S., Barco, J.L., and Bollati, R. 2009. Upper Cretaceous vertebrates from El Anfiteatro area, Río Negro, Patagonia, Argentina. Cretaceous Research 30: 767–784.
• Sampson, S.D., Carrano, M.T., and Forster, C.A. 2001. A bizarre predatory dinosaur from the Late Cretaceous of Madagascar. Nature 409: 504–506.
• Sankey, J.T. 2001. Late Campanian southern dinosaurs, Aguja Formation, Big Bend, Texas. Journal of Paleontology 75: 208–215.
• Sankey, J.T., Brinkman, D.B., Guenther, M., and Currie, P.J. 2002. Small theropod and bird teeth from the Late Cretaceous (Late Campanian) Judith River Group, Alberta. Journal of Paleontology 76: 751–763.
• Sereno, P.C., Rao, C., and Li, J. 2002. Sinornis santensis (Aves: Enanthiornithes) from the Early Cretaceous of Northeastern China. In: L.M. Chiappe and L.M. Witmer (eds.), Mesozoic Birds, Above the Heads of Dinosaurs, 184–208. University of California Press, Berkeley.
• Smith, J.B. 2007. Dental morphology and variation in Majungasaurus crenatissimus (Theropoda: Abelisauridae) from the Late Cretaceous of Madagascar. Journal of Vertebrate Paleontology 27 (Supplement 8): 103–126.
• Smith, J.B. and Dalla Vecchia, F.M. 2006. An abelisaurid (Dinosauria: Theropoda) tooth from the Lower Cretaceous Chicla Formation of Libya. Journal of African Earth Sciences 46: 240–244.
• Smith, J.B., Vann, D.R., and Dodson, P. 2005. Dental morphology and variation in theropod dinosaurs: implications for the taxonomic identification of isolated teeth. The Anatomical Record, Part A 285A: 699–736.
• Sues, H.−S. 1977. The skull of Velociraptor mongoliensis, a small Cretaceous theropod dinosaur from Mongolia. Paläontologische Zeitschrift 51: 173–184.
• Sweetman, S.C. 2004. The first record of velociraptorine dinosaurs (Saurischia, Theropoda) from the Wealden (Early Cretaceous, Barremian) of southern England. Cretaceous Research 25: 353–364.
• Turner, A.H., Hwang, S.H., and Norell, M.A. 2007a. A small derived theropod from Öösh, Early Cretaceous, Baykhangor Mongolia. American Museum Novitates 3557: 1–27.
• Turner, A.H., Pol, D., Clark, J.A., Erickson, G.M., and Norell, M.A. 2007b. A basal dromaeosaurid and size evolution preceding avian flight. Science 317: 1378–1381.
• Veralli, C. and Calvo, J.O. 2004. Dientes de terópodos carcarodontosáuridos del Turoniano superior−Coniaciano inferior del Neuquén, Patagonia, Argentina. Ameghiniana 41: 587–590.
• Vullo, R., Neraudeau, D., and Lenglet, T. 2007. Dinosaur teeth from the Cenomanian of Charentes, Western France: evidence for a mixed Laurasian–Gondwanian assemblage. Journal of Vertebrate Paleontology 27: 931–943.
• Xu, X. 2002. Deinonychosaurian Fossils from the Jehol Group of Western Liaoning and the Coelurosaurian Evolution. 325 pp. Unpublished Ph.D. thesis, The Chinese Academy of Sciences, Beijing.
• Xu, X. and Norell, M.A. 2004. A new troodontid dinosaur from China with avian−like sleeping posture. Nature 431: 838–841.
• Xu, X. and Wu, X.−C. 2001. Cranial morphology of Sinornithosaurus millenii Xu, Wang, and Wu 1999 (Dinosauria: Theropoda: Dromaeosauridae) from the Yixian Formation of Liaoning, China. Canadian Journal of Earth Siences 38: 1739–1752.
• Xu, X., Wang, X.−L., and Wu, X.−C. 1999. A dromaeosaurid dinosaur with a filamentous integument from the Yixian Formation of China. Nature 401: 262–266.
• Xu, X., Zhou, Z.−H., and Wang, X. 2000. The smallest known non−avian theropod dinosaur. Nature 408: 705–708.
• Xu, X., Norell, M.A., Wang, X.−L., Makovicky, P.J., and Wu, X.−C. 2002. A basal troodontid from the Early Cretaceous of China.Nature 415: 78–784.
• Xu, X., Zhou, Z.−H., Wang, X., Kuang, X., Zhang, F., and Du, X. 2003. Four−winged dinosaurs from China. Nature 421: 335–340.
• Zhang, F. and Zhou, Z. 2000. A primitive enanthiornithine bird and the origin of feathers. Science 290: 1955–1959.
• Zhang, F., Zhou, Z., Hou, L., and Gu, G. 2001. Early diversification of birds: evidence from a new opposite bird.Chinese Science Bulletin 46: 945–949.
• Zhou, Z. and Hou, L. 2002. The discovery and study of mesozoic birds in China. In: D.B. Weishampel, P. Dodson, and H. Osmólska (eds.), The Dinosauria, 160–183. University of California Press, Berkeley.
• Zhou, Z. and Zhang, F. 2002. A long−tailed, seed−eating bird from the Early Cretaceous of China. Nature 418: 405–409.
• Zinke, J. 1998. Small theropod teeth from the Upper Jurassic coal mine of Guimarota (Portugal). Paläontologische Zeitschrift 72: 179–189.