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ple's Republic of China. ( 英 文 ). Brinkman D B;Eberth D A; Ryan M J; Chen P j. CanadianJournal of Earth Sciences, 2001, 38(12): 1781-1786A partial specimen of Psittacosaurus xinjiangensisfrom the Urho locality in the WesternJunggar basin, China, extends the known geographicalrange of P. xinjiangensis and documentsthe adult morphology in this species.Variation in the number of denticles on the dentarytooth crowns is documented, possibly representinga decrease in the number of denticlesduring growth, although a high denticle countremains a diagnostic feature of the species.2008040436中 国 下 白 垩 统 一 新 的 甲 龙 类 及 关 于 甲 龙 类 间亲 缘 关 系 的 评 述 = A new ankylosaurid (Dinosauria:Ankylosauria) from the Lower Cretaceousof China, with comments on ankylosaurianrelationships. ( 英 文 ). Vickaryous M K;Russell A P; Currie P J; Zhao X J. CanadianJournal of Earth Sciences, 2001, 38(12): 1767-1780Amongst the fossil material collected by theSino-Soviet Expeditions (1959–1960) to the AlshanDesert, China, was a large, virtually completeankylosaur skeleton. Gobisaurus domoculusgen. et sp. nov. closely resembles Shamosaurusscutatus, but is distinct in having an unfusedbasipterygoid–pterygoid contact and elongatepremaxillary processes of the vomers. Althoughit is difficult to make a definitive taxonomic assignmentwithout considering postcranial material,a preliminary phylogenetic analysis placesGobisaurus as the sister taxon of Shamosaurus,clustered as one of several successive outgroupsof the Ankylosaurinae.2008040437中 国 白 垩 纪 兽 足 亚 目 troodontids 的 新 信 息 =New information on Cretaceous troodontids (Dinosauria,Theropoda) from the People's Republicof China. ( 英 文 ). Currie P J; Zhiming D.. CanadianJournal of Earth Sciences, 2001, 38(12):1753-1766Troodontid specimens were recovered fromthree localities in China by the Sino-Canadianexpeditions between 1987 and 1990. These includea Lower Cretaceous form (Sinornithoidesyoungi), which is the most complete troodontidskeleton ever found, isolated bones from the IrenDabasu Formation (?Turonian), and partialskeletons of Saurornithoides mongoliensis fromDjadokhta-equivalent beds (?Campanian). These,and other specimens recently described fromNorth America, allow a better assessment of thephylogenetic position of troodontids than hasbeen possible before. Although troodontids haveautapomorphies that eliminate them from considerationas bird ancestors, they are neverthelessone of the closest avian outgroups within theTheropoda.2008040438辽 宁 义 县 组 兽 足 亚 目 Sinornithosaurus millenii头 盖 骨 形 态 = Cranial morphology of Sinornithosaurusmillenii Xu et al. 1999 (Dinosauria:Theropoda: Dromaeosauridae) from theYixian Formation of Liaoning, China. ( 英 文 ).Xu Xing; Wu Xiaochun. Canadian Journal ofEarth Sciences, 2001, 38(12): 1739-1752The recent discovery of the early dromaeosauridSinornithosaurus millenii Xu et al.1999 is especially important for our understandingof maniraptoran evolution, particularly ofavian origins. This paper presents a thoroughdescription of the skull of this species, revisesthe diagnosis based on cranial features, and discussessimilarities to those of other dromaeosauridsand Archaeopteryx. Distinctive cranialcharacteristics of S. millenii include thepresence of a deep excavation on the posteroventralmargin of the premaxilla, a diastema betweenthe premaxillary and maxillary teeth, anumber of pits and ridges on the anterolateralsurface of the antorbital fossa, long posterolateralprocess of the parietal that are sharplyposteriorly directed, the column-like margin ofthe pterygoid process of the quadrate, the bifurcatedposterior end of the dentary, and a distinctivegroove posterior to the anterior carina on thelingual surface of the premaxillary tooth crowns.The present study on the skull of S. millenii providesnew information on the poorly known cranialanatomy of dromaeosaurid dinosaurs, revealingthat dromaeosaurids share more similaritieswith Archaeopteryx than previously thought.It also provides evidence suggesting that earlydromaeosaurids are more bird-like than the later,more derived ones, thus contradicting claims thatmore bird-like dinosaurs appeared later in fossilrecord than the earliest birds.2008040439中 国 晚 白 垩 世 幼 年 霸 王 龙 Shanshanosaurushuoyanshanensis 新 知 = New information onShanshanosaurus huoyanshanensis, a juveniletyrannosaurid (Theropoda, Dinosauria) from theLate Cretaceous of China. ( 英 文 ). Currie P J;Dong Zhiming. Canadian Journal of Earth Sciences,2001, 38(12): 1729-1737Shanshanosaurus huoyanshanensis from theSubashi Formation (Upper Cretaceous) of Xinjiangin northwestern China has long been thoughtof as a distinctive genus of small theropod. Althoughusually assigned to its own family, it hasgenerally been included in the tyrannosaurid134