A NEW LATE JURASSIC DOCODONT （MAMMALIA） FROM NORTHEASTERN XINJIANG, CHINA
文献类型：期刊论文
| 作者 | HU YaoMing2; MENG Jin2 ; James M CLARK1
|
| 刊名 | VERTEBRATA PALASIATICA
 |
| 出版日期 | 2007 |
| 卷号 | 45期号:3页码:173 |
| 关键词 | 新疆 晚侏罗世 柱齿兽目 尖钝齿兽 系统发育 Xinjiang Late Jurassic Docodonta Acuodulodon phylogeny |
| ISSN号 | 1000-3118 |
| 英文摘要 | A new genus and species of docodontid(Docodonta,Mammalia),Acuodulodon sunae, represented by a partial left lower jaw and dentition,is described.It is from the upper part of the Shi- shugou Formation in the Wucaiwan area of the Junggar Basin in northeastern Xinjiang,China,with an estimated age of 159～161 Ma(Oxfordian,early Late Jurassic).The new mammal is typical of docodonts in having a cusp b in front of cusp a,a cusp c distolingual to cusp a and a cusp g mesiolin- gual to cusp a on lower molariforms.Differing from other docodonts,it has no cusp e or crest b-e de- veloped on lower molariforms.Unique among docodonts,cusps a and c of the new animal maintained their sharpness while cusp g and crest b-g wore away fast,indicating that both shearing and crush- ing/grinding occurred in the chewing cycle and probably last for most of the life span of the animal. Phylogenetic analysis of a data matrix with 24 lower molariform characters across 15 taxa recovers a monophyletic Docodonta,which has distinct diagnostic:characters in lower molariforms.Within doco- donts,Docodon and Borealestes are successively basal to other docodonts;Acuodulodon and Itatodon +(Simpsonodon,Castorocauda+(Tegotherium+Sibirotherium))form a monophyletic clade. Tegotheriid genera are nested within Docodontidae,but a monophyletic tegotheriid clade composed of Tegotherium,Sibirotherium,Itatodon,and Tashkumyrodon is not recovered.The dentary of Acuodu- Iodon is typical of docodonts.It has a shallow postdentary trough and a wide and sharp medial ridge, both of which do not extend onto the medial side of the condylar peduncle,indicating looser contact between postdentary bones and the dentary than in morganucodontids,a more derived condition in the evolution toward the definitive mammalian middle ear. |
| 语种 | 英语 |
| 源URL | [http://119.78.100.205/handle/311034/22349]  |
| 专题 | 中国科学院古脊椎动物与古人类研究所 |
| 作者单位 | 1.Division of Paleontology, American Museum of Natural History New York NY 2.中国科学院古脊椎动物与古人类研究所 |
| 推荐引用方式 GB/T 7714 | HU YaoMing,MENG Jin,James M CLARK. A NEW LATE JURASSIC DOCODONT （MAMMALIA） FROM NORTHEASTERN XINJIANG, CHINA[J]. VERTEBRATA PALASIATICA,2007,45(3):173. |
| APA | HU YaoMing,MENG Jin,&James M CLARK.(2007).A NEW LATE JURASSIC DOCODONT （MAMMALIA） FROM NORTHEASTERN XINJIANG, CHINA.VERTEBRATA PALASIATICA,45(3),173. |
| MLA | HU YaoMing,et al."A NEW LATE JURASSIC DOCODONT （MAMMALIA） FROM NORTHEASTERN XINJIANG, CHINA".VERTEBRATA PALASIATICA 45.3(2007):173. |
入库方式： OAI收割
来源：古脊椎动物与古人类研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。