KMS Nanjing Institute of Geology and Palaeonotology,CAS
A new eutriconodont mammal and evolutionary development in early mammals | |
Luo, Zhe-Xi; Chen, Peiji (陈丕基); Li, Gang (李罡); Chen, Meng | |
2007-03-15 | |
发表期刊 | NATURE |
ISSN | 0028-0836 |
卷号 | 446期号:7133页码:288-293 |
摘要 | Detachment of the three tiny middle ear bones from the reptilian mandible is an important innovation of modern mammals. Here we describe a Mesozoic eutriconodont nested within crown mammals that clearly illustrates this transition: the middle ear bones are connected to the mandible via an ossified Meckel's cartilage. The connected ear and jaw structure is similar to the embryonic pattern in modern monotremes (egg-laying mammals) and placental mammals, but is a paedomorphic feature retained in the adult, unlike in monotreme and placental adults. This suggests that reversal to (or retention of) this premammalian ancestral condition is correlated with different developmental timing (heterochrony) in eutriconodonts. This new eutriconodont adds to the evidence of homoplasy of vertebral characters in the thoraco-lumbar transition and unfused lumbar ribs among early mammals. This is similar to the effect of homeobox gene patterning of vertebrae in modern mammals, making it plausible to extrapolate the effects of Hox gene patterning to account for homoplastic evolution of vertebral characters in early mammals. |
DOI | 10.1038/nature05627 |
语种 | 英语 |
关键词[WOS] | Ossified Meckels Cartilage ; Middle-ear ; Mesozoic Mammals ; Hox Genes ; Origin ; Diversification ; Constraints ; Phylogeny ; Skeleton ; China |
WOS研究方向 | Science & Technology - Other Topics |
WOS类目 | Multidisciplinary Sciences |
WOS记录号 | WOS:000244892900038 |
出版者 | NATURE PUBLISHING GROUP |
文献类型 | 期刊论文 |
条目标识符 | http://ir.nigpas.ac.cn/handle/332004/71 |
专题 | 中国科学院南京地质古生物研究所 其他 |
通讯作者 | Luo, Zhe-Xi |
作者单位 | 1.Carnegie Museum Nat Hist, Pittsburgh, PA 15213 USA 2.Nanjing Univ, Dept Earth Sci, Nanjing 210093, Peoples R China 3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Strat, Nanjing 210008, Peoples R China |
推荐引用方式 GB/T 7714 | Luo, Zhe-Xi,Chen, Peiji ,Li, Gang ,et al. A new eutriconodont mammal and evolutionary development in early mammals[J]. NATURE,2007,446(7133):288-293. |
APA | Luo, Zhe-Xi,Chen, Peiji ,Li, Gang ,&Chen, Meng.(2007).A new eutriconodont mammal and evolutionary development in early mammals.NATURE,446(7133),288-293. |
MLA | Luo, Zhe-Xi,et al."A new eutriconodont mammal and evolutionary development in early mammals".NATURE 446.7133(2007):288-293. |
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