辽宁义县组禽龙类恐龙一新属种——义县薄氏龙Bolong yixianensis gen. et sp. nov.  

Bolong yixianensis gen. et sp. nov.:A NEW IGUANODONTOID DINOSAUR FROM THE YIXIAN FORMATION OF WESTERN LIAONING,CHINA

作　　者：吴文昊[1] Pascal Godefroit 胡东宇[3] 

机构地区：[1]吉林大学古生物学与地层学研究中心,吉林长春130026 [2]比利时皇家自然科学研究所 [3]沈阳师范大学古生物研究所,辽宁沈阳110034

出　　处：《地质与资源》2010年第2期127-133,共7页Geology and Resources

基　　金：教育部与国家外专局古生物演化引智基地项目(B06008)资助

摘　　要：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.The sub-complete skeleton of a new basal iguanodontoid,Bolong yixianensis gen.et sp.nov.,was discovered in the Yixian Formation of Western Liaoning Province,China.This new taxon is characterized by several cranial and dental autapomorphies：a depressed area at the junction between maxilla and lachrymal,the caudal ramus of prefrontal forming a rostrocaudally depressed area above the orbital margin,the ventral process running caudally parallel to the ventral margin of the predentary,the rostrodorsal articular surface for the predentary occupying less than two-thirds of the height of the dentary and the rostral tip of dentary therefore situated above the ventral third of the bone,and the primary ridge deflected distally on maxillary crowns.It differs from Jinzhousaurus,also from the Yixian Fm of Western Liaoning by at least 14 cranial and dental characters,including the not-down-turned rostral tip in its maxilla,bifurcate ventral process in predentary,with several secondary ridges on maxillary teeth,etc.Bolong is one of the most basal iguanodontoids ever discovered in Asia.

关 键 词：禽龙超科 早白垩世 热河生物群 义县薄氏龙 辽宁义县 

分 类 号：Q915.86[天文地球—古生物学与地层学]