Pour en savoir un peu plus sur Urbacodon:
(source:dinodata)
ABSTRACT—Based on a review of troodontid specimens from the territories of the former Soviet Union, including new discoveries from Uzbekistan, two dental morphotypes can be distinguished among Troodontidae from the Cretaceous of Asia: (1) unserrated teeth, present in Mei from Lujiatun (China; Early Cretaceous: Hauterivian-Barremian), an unnamed taxon from Hövöör (Mongolia; Early Cretaceous: Aptian-Albian), Urbacodon itemirensis, gen. et sp. nov. from Itemir and Urbacodon sp. from Dzharakuduk (Uzbekistan; Late Cretaceous: Cenomanian and Turonian, respectively), and Archaeornithoides from Bayn Dzak and Byronosaurus from Ukhaa Tolgod (Mongolia; Late Cretaceous: Campanian); and (2) serrated teeth, present in Sinornithoides from Huamuxiao (China; Early Cretaceous) and Sinornithoides-like taxa from Khamryn Us (Mongolia; Early Cretaceous: Aptian-Albian), Shestakovo (Russia; Early Cretaceous: Aptian-Albian), and Sheikhdzheili (Uzbekistan; Late Cretaceous: Cenomanian); Troodontidae indet. from Kansai (Tajikistan; Late Cretaceous: Santonian) and Alymtau (Kazakhstan; Late Cretaceous: Campanian), Saurornithoides (Mongolia and China; Late Cretaceous: Campanian-Maastrichtian), and Troodon from Kakanaut and Blagoveshchensk (Russia; Late Cretaceous: Maastrichtian).
Il y a encore Sinovenator changii Xu et al. 2002, Sinornithoides youngi Russel et Dong 1994,
Saurornithoides mongoliensis Osborn 1924, Saurornithoides junior Barsbold 1974,
Koparion douglassi Chure 1994, Sinusonasus magnodens Xu et Wang 2004, et Mei long et peut etre encore d'autres.
les references sont:
Xu, X., Norell, M.A., Wang, X.-L, Makovicky, P.J.& Wu, X.-C. (2002) A basal troodontid from the Early Cretaceous of China. Nature 415:780-784.
Russell, D.A. & Dong, Z.M (1993). A nearly complete skeleton of a new troodontid dinosaur from the Early Cretaceous of the Ordos Basin, Inner Mongolia, People's Republic of China. Can. J. Earth Sci. 30, 2163-2173.
Osborn, H.F. (1924). Three new Theropoda, Protoceratops zone, central Mongolia. Amer. Mus. Novitates 144, 1-12
Barsbold, R. (1974). Saurornithoididae, a new family of small theropod dinosaurs from Central Asia and North America. Palaeontologia Polonica. (30): 5-22.
Chure, D.J. (1994). Koparion douglassi, a New Dinosaur from the Morrison Formation (Upper Jurassic) of Dinosaur National Monument; The Oldest Troodontid ( Theropoda: Maniraptora). Byu Geology Studies. 40: 11-15.
Xu, X. & Wang, X. (2004) A New Troodontid (Theropoda: Troodontidae) from the Lower Cretaceous Yixian Formation of Western Liaoning, China Acte Geologica Sinica Vol.78 No.1 pp.22-26
Xu X. & Norell. M.A. (2004) A new troodontid dinosaur from China with avian-like sleeping posture. Nature 431:838-841.
Les Dromaeosauridae et proches (Troodontidae), selon M.Mortimer, en prenant en compte les dernières observations sur Archaeopteryx et les dernières découvertes de Dromaeosauridae:
C'est une classification que l'on trouve parfois sur le net et dans les bouquins qui datent un peu ... moi je préfère la classification de The Dinosauria ...