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A basal dromaeosaurid and size evolution preceding avian flight.
Science. 2007 Sep 07; 317(5843):1378-81.Sci

Abstract

Fossil evidence for changes in dinosaurs near the lineage leading to birds and the origin of flight has been sparse. A dinosaur from Mongolia represents the basal divergence within Dromaeosauridae. The taxon's small body size and phylogenetic position imply that extreme miniaturization was ancestral for Paraves (the clade including Avialae, Troodontidae, and Dromaeosauridae), phylogenetically earlier than where flight evolution is strongly inferred. In contrast to the sustained small body sizes among avialans throughout the Cretaceous Period, the two dinosaurian lineages most closely related to birds, dromaeosaurids and troodontids, underwent four independent events of gigantism, and in some lineages size increased by nearly three orders of magnitude. Thus, change in theropod body size leading to flight's origin was not unidirectional.

Authors+Show Affiliations

Division of Paleontology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024-5192, USA. turner@amnh.orgNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

17823350

Citation

Turner, Alan H., et al. "A Basal Dromaeosaurid and Size Evolution Preceding Avian Flight." Science (New York, N.Y.), vol. 317, no. 5843, 2007, pp. 1378-81.
Turner AH, Pol D, Clarke JA, et al. A basal dromaeosaurid and size evolution preceding avian flight. Science. 2007;317(5843):1378-81.
Turner, A. H., Pol, D., Clarke, J. A., Erickson, G. M., & Norell, M. A. (2007). A basal dromaeosaurid and size evolution preceding avian flight. Science (New York, N.Y.), 317(5843), 1378-81.
Turner AH, et al. A Basal Dromaeosaurid and Size Evolution Preceding Avian Flight. Science. 2007 Sep 7;317(5843):1378-81. PubMed PMID: 17823350.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A basal dromaeosaurid and size evolution preceding avian flight. AU - Turner,Alan H, AU - Pol,Diego, AU - Clarke,Julia A, AU - Erickson,Gregory M, AU - Norell,Mark A, PY - 2007/9/8/pubmed PY - 2007/9/22/medline PY - 2007/9/8/entrez SP - 1378 EP - 81 JF - Science (New York, N.Y.) JO - Science VL - 317 IS - 5843 N2 - Fossil evidence for changes in dinosaurs near the lineage leading to birds and the origin of flight has been sparse. A dinosaur from Mongolia represents the basal divergence within Dromaeosauridae. The taxon's small body size and phylogenetic position imply that extreme miniaturization was ancestral for Paraves (the clade including Avialae, Troodontidae, and Dromaeosauridae), phylogenetically earlier than where flight evolution is strongly inferred. In contrast to the sustained small body sizes among avialans throughout the Cretaceous Period, the two dinosaurian lineages most closely related to birds, dromaeosaurids and troodontids, underwent four independent events of gigantism, and in some lineages size increased by nearly three orders of magnitude. Thus, change in theropod body size leading to flight's origin was not unidirectional. SN - 1095-9203 UR - https://www.unboundmedicine.com/medline/citation/17823350/A_basal_dromaeosaurid_and_size_evolution_preceding_avian_flight_ DB - PRIME DP - Unbound Medicine ER -