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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 neoceratopsiaus 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 Coronosauria.  相似文献
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    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。  相似文献
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在辽西义县组新发现了一具近完整的禽龙类化石骨架.据头骨和牙齿特征建立了一新属、新种--义县薄氏龙(Bolong yixianensis gen.et sp.nov.).它的自近裔性状包括:上颌骨与泪骨之间有一凹坑;在眼眶之上,前额骨后部发育有一前后延长的凹陷;前额骨后侧边缘发育一厚嵴,在厚嵴之上有一前后延长的凹陷;前齿骨腹突向后延伸并与前齿骨腹缘平行;齿骨背侧的前齿骨关节面高度不足齿骨高度的2/3,齿骨前尖位于齿骨自下向上1/3高处;上颌骨牙齿主脊位于牙齿颊面后1/3处,并向后弯曲.与同样在辽西义县组发现的锦州龙Jinzhousaurus的头骨和牙齿相比较,薄氏龙至少有14处不同.包括上颌骨前端不下弯、前齿骨腹突分叉和上颌骨齿齿冠有多条副脊等.它也是迄今在亚洲发现的几种最原始的禽龙类之一.  相似文献
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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 Coronosauria.  相似文献
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