CAJ | 학술논문

描述了戈壁锥齿兽科(Gobiconodontidae)一个新的属种--陆家屯弥曼齿兽(Meeman-nodon 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.弥曼齿兽与戈壁锥齿兽及其相近属的区别在于:下门齿和下犬齿更加平伏,i1在比例上更大,而i2则更小;最后一枚下前臼齿与第一枚下臼齿之间没有齿隙;前臼齿退化;下臼齿长度大于高度,主尖向后倾斜,与b尖和c尖相比,a尖较低,m1显著小于m2～4.新属下臼齿没有齿带,与爬兽(Repenomamus)相似,而与戈壁锥齿兽不同.基于与爬兽齿列的对比,讨论了戈壁锥齿兽类的齿式,认为其应具有两颗门齿,而不是以前认为的1颗门齿,从而将戈壁锥齿兽类下齿列齿式修订为:2·1·2～3·5.
묘술료과벽추치수과(Gobiconodontidae)일개신적속충--륙가둔미만치수(Meeman-nodon lujiatunensis gen.et sp.nov.).표본산우료녕서부조양시상완진륙가둔하백성통의현조일단적응회질사암층중,위일구완정치렬적좌하합골.신속여과벽추치수(Gobiconodon)공유이하구별우기타삼첨치수류적특정:2과하문치,i1증대,후부문치、견치화전부전구치첨추형,전구치구유고적중앙첨화소적부첨,i～p1향전평복.인차,신속피귀입과벽추치수과.미만치수여과벽추치수급기상근속적구별재우:하문치화하견치경가평복,i1재비례상경대,이i2칙경소;최후일매하전구치여제일매하구치지간몰유치극;전구치퇴화;하구치장도대우고도,주첨향후경사,여b첨화c첨상비,a첨교저,m1현저소우m2～4.신속하구치몰유치대,여파수(Repenomamus)상사,이여과벽추치수불동.기우여파수치렬적대비,토론료과벽추치수류적치식,인위기응구유량과문치,이불시이전인위적1과문치,종이장과벽추치수류하치렬치식수정위:2·1·2～3·5.
A new genus and species of gobiconodotid, Meemannodon lujiatunensis, from the basal member of the Early Cretaceous Yixian Formation at Lujiatun locality , Lianing, northeast China is described. The new genus, Mee,annodon, differs from other triconodonts but is similar to Godiconodon in having enlerged 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 comeared to distinct cusps b and c, premolariforms reduced, and m1 signiflcantly smaller than m2～m4. It is similar to Repenomamus but further differs from Gobiconodon in lacking the cingulid on lower molariforms.