辽西早白垩世义县组燕子沟辽角龙(Liaoceratops yanzigouensis)新材料

摘要

报道了一件产自辽西北票地区早白垩世义县组陆家屯层中的燕子沟辽角龙(Liaoceratops yanzigouensis)化石标本.该标本保存了燕子沟辽角龙的一些典型特征:前颌齿3颗;较大的三角形的眶前窝,外颧骨不发育;前齿骨上翘呈钩状;下颌后腹缘的边棱脊发育,并在其后部发育瘤状结节.根据对化石的CT扫描和三维图像重建,笔者对燕子沟辽角龙吻骨的形态特征进行了补充,包括吻骨前缘呈龙骨脊状,后侧发育一棱柱状纵脊等.此外,首次对燕子沟辽角龙的头后骨骼进行了描述,其中,股骨第四转子的特征可能对基干新角龙类的分类有一定意义.%A new specimen of Liaoceratops yanzigouensis is described from Lujiatun Bed of the Early Cretaceous Yixian Formation in Beipiao,western Liaoning.The specimen shows the typical characters of Liaoceratops:three premaxillary teeth;large triangular antorbital fossa;epijugal absent;predentary hooked dorsally;and ventral flange presents along the mandible with several tubercles.New morphological information of the rostral has been revealed through the three-dimensional reconstructions based on CT scanning,the rostral is keeled anteriorly and bears a broad vertical crest along its posterior midline.The postcranial skeleton of Liaoceratops yanzigouensis is described for the first time.The profile and position of the fourth trochanter is possibly valuable for the classification of the basal neoceratopsians.