A new basal neoceratopsian dinosaur, Helioceratops brachygnathus gen. et sp. nov., is described from the Quantou Formation （late Early Cretaceous or early Late Cretaceous） in the Liufangzi locality （Jilin province,...A new basal neoceratopsian dinosaur, Helioceratops brachygnathus gen. et sp. nov., is described from the Quantou Formation （late Early Cretaceous or early Late Cretaceous） in the Liufangzi locality （Jilin province, China）. Helioceratops differs from other basal neoceratopsians with its deep dentary ramus, its steeply-inclined ventral predentary facet, its heterogeneous dentary crowns, and by the denticles and secondary ridges asymmetrically distributed on either side of the primary ridge on its dentary teeth. Along with Auroraceratops and Yamaceratops, Helioceratops represents one of the most derived non-coronosaurian neoceratopsians. The palaeogeographical distribution of basal neoceratopsians appears limited to northern China and southern Mongolia in the current state of our knowledge. It is therefore probable that this region constituted the birthplace for more advanced, Late Cretaceous Coronosanria.展开更多
Four main dinosaur-bearing sites have been investigated in latest Cretaceous deposits from the Amur/Heilongjiang Region: Jiayin and Wulaga in China (Yuliangze Formation) ,Blagoveschensk and Kundur in Rus- sia (Udurchu...Four main dinosaur-bearing sites have been investigated in latest Cretaceous deposits from the Amur/Heilongjiang Region: Jiayin and Wulaga in China (Yuliangze Formation) ,Blagoveschensk and Kundur in Rus- sia (Udurchukan Formation) . More than 90% of the bones discovered in these localities belong to hollowcrested lambeosaurine hadrosaurids: Charonosaurus jiayinensis at Jiayin,Amurosaurus riabinini at Blagoveschensk, Olorotitan arharensis at Kundur,and Sahaliyania elunchunorum at Wulaga. Flat-headed hadrosaurine hadrosau- rids are much less numerous,but appear well diversified as well: Kerberosaurus manakini at Blagoveschensk, Wulagasaurus dongi at Wulaga,and a new genus at Kundur. Theropods are represented by shed teeth and isolated bones; isolated scutes and teeth discovered at Kundur are tentatively attributed to nodosaurids. Palynologi- cal studies suggest that these sites are probably synchronous with the Lancian' vertebrate localities of western North America,which represent the youngest dinosaur faunas in this area. However,the latest Cretaceous dinosaur assemblages are completely different in the Amur/Heilongjiang region (lambeosaurines abundant,ceratopsids absent) and in western North America (ceratopsids abundant,lambeosaurines extremely rare or absent) . This probably reflects some kind of geographical barrier between both areas by Maastrichtian time rather than strong differences in palaeoecological conditions.展开更多
Abundant dinosaur remains have been discovered from the Heilongjiang/Amur area for over one hundred years.Among these discoveries,an isolated small theropod tooth recently found from the lower part of the Yuliangzi Fo...Abundant dinosaur remains have been discovered from the Heilongjiang/Amur area for over one hundred years.Among these discoveries,an isolated small theropod tooth recently found from the lower part of the Yuliangzi Formation of Jiayin displays highly distinctive morphological features.It can be identified as a Troodon-morphotype tooth based on mesiodistal constriction at the base of the crown and large,hook-like denticles extending the entire length of both carinae.Previously,Troodon remains were mainly found in North America.Some isolated Troodon teeth were also discovered in Blagoveschensk and Kundur localities on the left bank of the Heilongjiang river.This specimen represents the first occurrence of Troodon-morphotype tooth in Jiayin,Heilongjiang,Northeast China.The presence of this taxon in Jiayin,Blagoveschensk and Kundur localities in the Heilongjiang area provides new evidence for faunal exchange between North America and Asia through Cretaceous Beringia.展开更多
文摘鸭嘴龙科(Hadrosauridae)化石根据头骨特征等被划分为鸭嘴龙亚科(Hadrosaurinae,无头冠)和赖氏龙亚科(Lambeosaurinae,有头冠)。黑龙江嘉荫龙骨山晚白垩世渔亮子组保存了丰富的鸭嘴龙化石,其中黑龙江满洲龙Mandschurosaurus amurensis(Riabinin,1925)是最早在中国发现的恐龙,属鸭嘴龙亚科;嘉荫卡龙Charonosaurus jiayinensis(Godefroit et al,2000)也是在这里发现的,属赖氏龙亚科。本文描述了采自嘉荫龙骨山的部分左齿骨化石和一些牙齿化石,新的化石明显属于鸭嘴龙亚科,主要特征为:齿骨每个牙列有5个以上的牙齿,牙冠边缘小锯齿由乳头状小瘤构成。新发现的牙齿牙冠上发育有明显的第二、三副脊,这在鸭嘴龙中是罕见的。新发现的化石明显不同于产于同一地点的嘉荫卡龙,但由于黑龙江满洲龙模式标本没有保存牙齿,因此暂不能与之充分对比。
基金the National Infrastructure of Mineral Rock and Fossil Resources for Sciences and Technology Program(2005DKA21405-7)the Science and Technology Research and Development Program of Changchun City(04-07SF092)supported by an FNRS grant.
文摘A new basal neoceratopsian dinosaur, Helioceratops brachygnathus gen. et sp. nov., is described from the Quantou Formation （late Early Cretaceous or early Late Cretaceous） in the Liufangzi locality （Jilin province, China）. Helioceratops differs from other basal neoceratopsians with its deep dentary ramus, its steeply-inclined ventral predentary facet, its heterogeneous dentary crowns, and by the denticles and secondary ridges asymmetrically distributed on either side of the primary ridge on its dentary teeth. Along with Auroraceratops and Yamaceratops, Helioceratops represents one of the most derived non-coronosaurian neoceratopsians. The palaeogeographical distribution of basal neoceratopsians appears limited to northern China and southern Mongolia in the current state of our knowledge. It is therefore probable that this region constituted the birthplace for more advanced, Late Cretaceous Coronosanria.
基金the Belgian State,Federal Scientific Policy,S&T bilateral co-operation project BL/36/C22-R12National Geographic Society project 6970-01+4 种基金Jurassic FoundationFWOFNRSNSFC Project 30220130698supported by the Fonds pour la Formationàla Recherche dans l'Industrie et dans l'Agriculture
文摘Four main dinosaur-bearing sites have been investigated in latest Cretaceous deposits from the Amur/Heilongjiang Region: Jiayin and Wulaga in China (Yuliangze Formation) ,Blagoveschensk and Kundur in Rus- sia (Udurchukan Formation) . More than 90% of the bones discovered in these localities belong to hollowcrested lambeosaurine hadrosaurids: Charonosaurus jiayinensis at Jiayin,Amurosaurus riabinini at Blagoveschensk, Olorotitan arharensis at Kundur,and Sahaliyania elunchunorum at Wulaga. Flat-headed hadrosaurine hadrosau- rids are much less numerous,but appear well diversified as well: Kerberosaurus manakini at Blagoveschensk, Wulagasaurus dongi at Wulaga,and a new genus at Kundur. Theropods are represented by shed teeth and isolated bones; isolated scutes and teeth discovered at Kundur are tentatively attributed to nodosaurids. Palynologi- cal studies suggest that these sites are probably synchronous with the Lancian' vertebrate localities of western North America,which represent the youngest dinosaur faunas in this area. However,the latest Cretaceous dinosaur assemblages are completely different in the Amur/Heilongjiang region (lambeosaurines abundant,ceratopsids absent) and in western North America (ceratopsids abundant,lambeosaurines extremely rare or absent) . This probably reflects some kind of geographical barrier between both areas by Maastrichtian time rather than strong differences in palaeoecological conditions.
基金Supported by National Nature Science Foundation of China(No.41202012).
文摘Abundant dinosaur remains have been discovered from the Heilongjiang/Amur area for over one hundred years.Among these discoveries,an isolated small theropod tooth recently found from the lower part of the Yuliangzi Formation of Jiayin displays highly distinctive morphological features.It can be identified as a Troodon-morphotype tooth based on mesiodistal constriction at the base of the crown and large,hook-like denticles extending the entire length of both carinae.Previously,Troodon remains were mainly found in North America.Some isolated Troodon teeth were also discovered in Blagoveschensk and Kundur localities on the left bank of the Heilongjiang river.This specimen represents the first occurrence of Troodon-morphotype tooth in Jiayin,Heilongjiang,Northeast China.The presence of this taxon in Jiayin,Blagoveschensk and Kundur localities in the Heilongjiang area provides new evidence for faunal exchange between North America and Asia through Cretaceous Beringia.
