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在蒙古南戈壁地区丘隆组(Chuluun Formation)和查干卡勒噶组(Tsagaankhaalga Formation) 发现的牙形刺证明丘隆组的时代为晚埃姆斯期,查干卡勒噶组的时代为早艾菲尔期,与以前大化石所确定的时代一致。但艾菲尔阶的底界暂时还无法准确确定,蒙古南戈壁地区艾菲尔阶牙形刺动物群与同期北美的牙形刺动物群相似,但也包含一些地方性分子,蒙古海相艾菲尔期的沉积可能不完整。本文描述了2 个命名新种,Caudicriodus delicatus sp. nov., C. paraculicellus sp. nov.,一个未命名新种,Caudicriodus sp. nov. A 和一个新亚种, Cuadicriodus angustus cauda subsp. nov.。
The conodonts found in the Chuluun Formation and Tsagaankhaalga Formation in the southern Gobi area of Mongolia confirm that the age of the Qiu Long Formation was Late Ames, the age of the Chagankalgar Formation was Early Eifel period, consistent with the era of large fossils. However, at the moment, the bottom boundary of the Eifelian rank can not be accurately determined yet. The Efferbandian conodont fauna in the southern Gobi region of Mongolia is similar to the conodont of North American congeners in the same period, but it also contains some endemic molecules, Phil’s deposition may not be complete. This article describes two new species named Caudicriodus delicatus sp. Nov., C. paraculicellus sp. Nov., An unnamed new species, Caudicriodus sp. Nov. A and a new subspecies Cuadicriodus angustus cauda subsp. Nov ..