古脊椎动物学报2011，Vol.49Issue(2)：201-209,9.
内蒙古大庙晚中新世仓鼠科一新种
A NEW SPECIES OF LATE MIOCENE HAMSTER ( CRICETIDAE,RODENTIA ) FROM DAMIAO, NEI MONGOL
摘要
Abstract
The Late Miocene witnessed the transition of cricetids from ancient to modernized taxa. Here we describe a new cricetid species, Nannocricetus wuae, from DM02, near the Damiao Village, Siziwangqi, Nei Mongol. The new species is characterized by having low crowned molars with conical shaped cusps, single anteroconid on ml with developed labial and/or lingual flanges, very weak to absent mesolophids on ml, variable mesolophid and very reduced anterolophulid on m2, narrow and slightly bifid anterocone on M1, and relatively long M3. Differing from the pattern of Cricetodontinae,Nannocricetus wuae shows great simplification of tooth structure. There is no paracone spur, anteromesoloph, or styles on upper molars, no spur of anterolophulid or stylids on lower molars. Root numbers are conservative, three for upper molars and two for lower molars. Morphologically, the new species shows close similarity to Nannocricetus primitivus and N. mongolicus. These three species constitute an endemic group confined to North China, and show progressive evolution in the splitting of the anteroconid on ml, reduction of the mesoloph( id), and development of anterolophule(id) on m2/M2 etc.Based on the evolutionary stage of the new species and associated fossils, we tentatively suggest an earliest Late Miocene age pending further confirmation by systematic study of other taxa and the paleomagnetic data.关键词
内蒙古大庙/晚中新世/仓鼠亚科Key words
Damiao/ Nei Mongol/ Late Miocene/ Cricetinae分类
生物科学引用本文复制引用
张兆群,王李花,刘艳,刘丽萍..内蒙古大庙晚中新世仓鼠科一新种[J].古脊椎动物学报,2011,49(2):201-209,9.基金项目
国家重点基础研究发展计划项目(编号:2006CB806400)和国家自然科学基金项目(编号:40672010,41072004,40711130639)资助. （编号:2006CB806400）
