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Vertebrata Palasiatica ›› 2005, Vol. 43 ›› Issue (01): 1-10.

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A NEW TRICONODONT (MAMMALIA) FROM THE EARLY CRETACEOUS YIXIAN FORMATION OF LIAONING, CHINA

Men Jin, Hu Yaoming, Wang Yuanqing, Li Chuankui   

  • Online:2005-03-15 Published:2005-03-15

辽宁早白垩世义县组一新的三尖齿兽类

孟津,  胡耀明,  王元青,  李传夔   

Abstract: A new genus and species of gobiconodotid, Meemannodon lujiatunensis, from the basal member of the Early Cretaceous Yixian Formation at Lujiatun locality, Liaoning, northeast China is described. The new genus, Meemannodon, differs from other triconodonts but is similar to Gobiconodon in having enlarged i1 , lower incisors reduced to 2 , conical and pointed posterior incisors , canines and anterior premolariforms , premolariforms with a tall central cusp but no accessory cusp , and procumbent i~p1. It differs from Gobiconodon and its close relatives in having more procumbent lower incisors and canines, proportionally larger i1 and smaller i2, lack of diastema between p2 (the last premolariform) and m1, main cusps of molariforms inclined posteriorly , molariform length greater than height , cusp a relatively low compared to distinct cusps b and c, premolariforms reduced , and m1 significantly smaller than m2~m4. It is similar to Repenomamus but further differs from Gobiconodon in lacking the cingulid on lower molariforms.

摘要: 描述了戈壁锥齿兽科( Gobiconodontidae) 一个新的属种———陆家屯弥曼齿兽( Meemannodon lujiatunensis gen. et sp. nov. ) 。标本产于辽宁西部朝阳市上园镇陆家屯下白垩统义县组一段的凝灰质砂岩层中,为一具完整齿列的左下颌骨。新属与戈壁锥齿兽( Gobiconodon) 共有以下区别于其他三尖齿兽类的特征: 2 颗下门齿,i1 增大,后部门齿、犬齿和前部前臼齿尖锥形,前臼齿具有高的中央尖和小的附尖,i~p1 向前平伏。因此,新属被归入戈壁锥齿兽科。弥