记述了山西天镇晚白垩世灰泉堡组发现的一鸭嘴龙超科恐龙新属种:天镇大同龙Datonglong tianzhenensis gen.et sp.nov.。标本为一保存较完好的右侧齿骨并带牙齿。与其他鸭嘴龙超科恐龙不同,大同龙每个齿槽有两个功能齿,而且舌面齿冠上嵴的发育也具有独特的特征组合(主嵴向远中方向偏移;次嵴发育;无其他附嵴;主嵴上半段略后弯)。对比研究发现,在较进步的非鸭嘴龙科鸭嘴龙超科类群中齿骨和牙齿的演化过程复杂,许多鸭嘴龙科的特征在这些类群中时而出现,如:巴克龙Bactrosaurus齿冠具有较大的高/宽比;吉尔摩龙Gilmoreosaurus齿冠上只有一个主嵴和纤弱的附嵴;张衡龙Zhanghenglong齿冠上主嵴中置;南宁龙Nanningosaurus下颌冠状突前倾;大同龙Datonglong每个齿槽有两个功能齿。这表明为了获得更有效的牙齿咀嚼方式,在鸭嘴龙科起源前它的姐妹群们曾进行过多种尝试;这也告诫我们,受大量趋同演化的影响,要厘清这些类群间的关系并非易事。 Describes a new species of Duckbill dragon found in the Late Cretaceous Ashwagandha Formation in Tianzhen, Shanxi: Datonglong Datonglong tianzhenensis gen.et sp.nov. The specimen was a well preserved right tooth with teeth. Unlike other duckbill dinosaurs, each Datong dragon has two functional teeth per tooth, and the development of the upper crest of the lingual crest also has a unique combination of features (the main ridge is offset to the far and middle direction; the development of the secondary crest ; No other attached ridges; the main ridge slightly curved after the first half). Comparative studies have found that evolutionary processes of the bones and teeth in the more advanced non-dinosaurs Duckbill dragon superfamily complex are complex and that many of the Buteozoans occur in these groups, such as the Bactrosaurus crown With a larger height / width ratio; Gilmoreosaurus crown has only one main ridge and weak cristae; Zhang Henglong tooth crown on the main ridge center; Nanning Long Nanningosaurus mandibular coronoid forward; Datong Long Datonglong A tooth groove has two function teeth. This shows that in order to obtain a more effective dental chewing method, its sister population had been tried many times before its origins; this also warned us that under the influence of a large number of convergence and evolution, to clarify the relationship between these groups is not Easy thing.