A new species of Gobiconodon(Triconodonta, Mammalia) and its implication for the age of Jehol Biota  

作　　者：LI Chuankui WANG Yuanqing HU Yaoming MENG Jin 

机构地区：[1]Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences,American Museum of Natural History Beijing 100044, China,Beijing 100044,China [2]American Museum of Natural History, New York, NY 10024, USA [3]Biology Program (Ecology, Evolutionary Biology, and Behavior), Graduate School and City College, City University of New York, NY 10016, USA,New York, NY 10024, USA

出　　处：《Chinese Science Bulletin》2003年第11期1129-1134,共6页

基　　金：This work was supported by the Major Basic Research Project of the Ministry of Science and Technology of China(Grant No.G2000077700);the National Natural Science Foundation of China(Grant No.49832020);the Chinese Academy of Sciences(Grant No.KZCX3-J-03).

摘　　要：A new species of Gobiconodon is found from the Yixian Formation of western Liaoning, China. The new taxa, G. zofiae sp. nov., has a confluent opening for branches Ⅱ and Ⅲ of the trigeminal nerve on the anterior lamina of the petrosal. G. zofiae sp. nov. is similar to Repenomamus in having an ossified Meckels cartilage connecting the lower jaws and ear region. The new species, with enlarged I1/I1, posteriorly located infraorbital foramen and four mental foramina, distinctly differs from the other species of Gobiconodon. The new material indicates that Gobiconodon has four, not five, upper molariforms. The presence of Gobiconodon in Jehol Biota makes it possible to correlate Jehol Biota with faunas in eastern Asia and North America, and suggests the age of the Yixian Formation to be Early Cretaceous.A new species of Gobiconodon is found from the Yixian Formation of western Liaoning, China. The new taxa, G. zofiae sp. nov., has a confluent opening for branches Ⅱ and Ⅲ of the trigeminal nerve on the anterior lamina of the petrosal. G. zofiae sp. nov. is similar to Repenomamus in having an ossified Meckels cartilage connecting the lower jaws and ear region. The new species, with enlarged I1/I1, posteriorly located infraorbital foramen and four mental foramina, distinctly differs from the other species of Gobiconodon. The new material indicates that Gobiconodon has four, not five, upper molariforms. The presence of Gobiconodon in Jehol Biota makes it possible to correlate Jehol Biota with faunas in eastern Asia and North America, and suggests the age of the Yixian Formation to be Early Cretaceous.

关 键 词：辽宁 白垩纪 骨化石 中生代 哺乳动物 头盖骨 

分 类 号：Q915[天文地球—古生物学与地层学]