skip to main content

A basal dromaeosaurid and size evolution preceding avian flight.(Report)

Turner, Alan H. ; Pol, Diego ; Clarke, Julia A. ; Erickson, Gregory M. ; Norell, Mark A.

Science, Sept 7, 2007, Vol.317(5843), p.1378(4) [Periódico revisado por pares]

Texto completo disponível

Citações Citado por
  • Título:
    A basal dromaeosaurid and size evolution preceding avian flight.(Report)
  • Autor: Turner, Alan H. ; Pol, Diego ; Clarke, Julia A. ; Erickson, Gregory M. ; Norell, Mark A.
  • Assuntos: Dinosaurs -- Research ; Dinosaurs -- Physiological Aspects ; Animal Flight -- Natural History ; Fossil Animals -- Physiological Aspects ; Dromaeosaurids -- Physiological Aspects
  • É parte de: Science, Sept 7, 2007, Vol.317(5843), p.1378(4)
  • Descrição: 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 dade 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
  • Idioma: English

Buscando em bases de dados remotas. Favor aguardar.