古脊椎动物学报（中英文）2026，Vol.64Issue(1)：26-46,21.DOI:10.19615/j.cnki.2096-9899.251201
陕西北部子长涧峪岔简齿始鼢鼠Eospalax simplicidens(啮齿目:鼹型鼠科)新材料
New material of Eospalax simplicidens(Spalacidae,Rodentia)from Jianyucha,Zichang,northern Shaanxi
摘要
Abstract
Eospalax,one of the only two extant genera within the Myospalacinae,has a high species richness.Each species is distinguished by unique cranial and dental morphologies,as well as variations in temporal and spatial distribution.Consequently,Eospalax serves as a reliable indicator for the biochronologic and paleoenvironmental studies of the Quaternary of East Asia.A recent discovery of a complete fossil skull in a conglomerate deposit,a part of the Lower Pleistocene Sanmen Formation,near Jianyucha Town,Zichang County,northern Shaanxi Province,has been subjected to a detailed analysis.The specimens were identified as Eospalax simplicidens,an extinct species of Eospalax,based on dental morphology.The recent discovery of E.simplicidens in Jianyucha offers significant insights into the species'cranial morphology and contributes to a more comprehensive understanding of its geographical distribution.The distinctive feature of the posterodorsal location of the external acoustic meatus indicates either a plesiomorphy or an evolutionary convergence among E.simplicidens,African root rats(Tachyoryctes),and bamboo rats(Rhizomyini).A skull(IVPP V5398.1)and four upper jaws(V5398.2)from Gongwangling in Lantian,Shaanxi,previously identified as Myospalax fontanieri,is transferred to the species E.lingtaiensis.A skull(IVPP RV35055)from Jingou,Xin'an,Henan,previously identified as E.simplicidens,is transferred to the species E.youngianus.In this study,body mass estimates are made for extinct Eospalax.Both E.lingtaiensis and E.simplicidens are small-sized zokors,with an estimated body mass of less than or approximately 300 g,respectively.关键词
陕西北部/黄土高原/早更新世/鼢鼠亚科/头骨形态Key words
northern Shaanxi/Loess Plateau/Early Pleistocene/Myospalacinae/cranial morphology分类
生物科学引用本文复制引用
常美静,史勤勤,倪喜军,李强..陕西北部子长涧峪岔简齿始鼢鼠Eospalax simplicidens(啮齿目:鼹型鼠科)新材料[J].古脊椎动物学报（中英文）,2026,64(1):26-46,21.基金项目
国家重点研发计划(编号:2023YFF0804500)和国家自然科学基金重点项目(批准号:42430207)资助. （编号:2023YFF0804500）
