古脊椎动物学报2010，Vol.48Issue(4)：328-335,8.
硅藻鼠科(哺乳纲,啮齿目)与亚洲中始新世啮齿类的双脊齿
THE DIATOMYIDAE (MAMMALIA,RODENTIA) AND BILOPHODONTY IN MIDDLE EOCENE ASIAN RODENTS
Mary R.DAWSON 1李传夔 2齐陶2
作者信息
- 1. 美国卡内基自然历史博物馆古脊椎动物学部,匹兹堡,PA 15213
- 2. 中国科学院古脊椎动物与古人类研究所,北京,100044
- 折叠
摘要
Abstract
The Asian endemic rodent family Diatomyidae is known to have inhabited eastern and southern Asia since the Oligocene.Its current distribution is limited to karstic regions of Laos.So far as known these hystricomorphous-sciurognathous rodents have some degree of transverse bilophodonty of the cheek teeth.The earliest recognized diatomyids,which are from the Oligocene of Pakistan,retain some traces of cusps on the cheek teeth,overlying the basically bilophodont tooth structure.By the end of the Oligocene there is some dental diversity within the family.Miocene and later diatomyids are relatively rare in the fossil record.Molecular evidence unites the diatomyids in the Ctenohystrica,an assignment that receives some support from the molar morphology of Eocene ctenodactyloids.Other than this connection.little is clear regarding the origin of the diatomyids.The middle Eocene Asian Hydentomys exhibits a slight degree of bilophodonty,but is otherwise unlike diatomyids.Another taxon of bilophodont rodent,Dolosimus n.gen.from the middle Eocene of Jiangsu Province,has still more precocious development of bilophodonty,especially in the lower molariform teeth.The incomplete record of this new taxon as well as its morphology cannot answer the question of whether this taxon is allied to such later appearing,strongly bilophodont rodents as diatomyids and pedetids,or is an early experiment of this striking morphological development that left no successors.关键词
亚洲/始新世/啮齿目/硅藻鼠科/双脊齿型颊齿Key words
Asia/Eocene/Rodentia/Diatomyidae/bilophodont cheek teeth分类
生物科学引用本文复制引用
Mary R.DAWSON,李传夔,齐陶..硅藻鼠科(哺乳纲,啮齿目)与亚洲中始新世啮齿类的双脊齿[J].古脊椎动物学报,2010,48(4):328-335,8.
