KMS Institute of Vertebrate Paleontology and Paleoanthropology
| Dental characters of the Quaternary tapirs in China, their significance in classification and phylogenetic assessment | |
| Tong, HW; Tong, HW (reprint author), Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, POB 643, Beijing 100044, Peoples R China. | |
| 2005 | |
| 发表期刊 | GEOBIOS
 |
| ISSN | 0016-6995 |
| 卷号 | 38期号:1页码:139-150 |
| 文章类型 | Article |
| 摘要 | Most of the Quaternary tapir fossils from China are isolated teeth. The purpose of this paper is to identify them and to extract systematic and evolutionary information from them. Based on morphology and W/L ratio, isolated teeth can be identified successfully. On the whole, the identification of P-1, M-3 and P-2 is believed to be reliable, while it is difficult to distinguish P-3 from P-4, M-1 from M-2 etc. Concerning the variations of the teeth, P-1 is the most variable one in dimension. In the Quaternary tapirs in China, some dental characters can be used as reliable indicators to evaluate their evolutionary levels. The degree of the atrophy of the upper canine relative to the caniniform 13 is reflected in the C/l(3) diameter ratio, which is decreasing during evolution. P' changes considerably in outline and strength of the hypocone. Some forms are without hypocone, such as Tapirus sanyuanensis, some have a very faint hypocone, such as Tapirus indicus; although most of them show a developed hypocone. For other cheek teeth, the W/L ratio is decreasing through geologic time. Two lineages can be tentatively proposed: one is the Tapirus peii-Tapirus sinensis-Megatapirus augustus progression; the other is the T sanyuanensis-T. indicus lineage. T sanyuanensis and T peii stand on the base, and it is very probable that the latter is more primitive. (C) 2005 Elsevier SAS. All rights reserved.; Most of the Quaternary tapir fossils from China are isolated teeth. The purpose of this paper is to identify them and to extract systematic and evolutionary information from them. Based on morphology and W/L ratio, isolated teeth can be identified successfully. On the whole, the identification of P-1, M-3 and P-2 is believed to be reliable, while it is difficult to distinguish P-3 from P-4, M-1 from M-2 etc. Concerning the variations of the teeth, P-1 is the most variable one in dimension. In the Quaternary tapirs in China, some dental characters can be used as reliable indicators to evaluate their evolutionary levels. The degree of the atrophy of the upper canine relative to the caniniform 13 is reflected in the C/l(3) diameter ratio, which is decreasing during evolution. P' changes considerably in outline and strength of the hypocone. Some forms are without hypocone, such as Tapirus sanyuanensis, some have a very faint hypocone, such as Tapirus indicus; although most of them show a developed hypocone. For other cheek teeth, the W/L ratio is decreasing through geologic time. Two lineages can be tentatively proposed: one is the Tapirus peii-Tapirus sinensis-Megatapirus augustus progression; the other is the T sanyuanensis-T. indicus lineage. T sanyuanensis and T peii stand on the base, and it is very probable that the latter is more primitive. (C) 2005 Elsevier SAS. All rights reserved. |
| 关键词 | Dental Characters Evolutionary Degree Tapir Quaternary China |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine |
| URL | 查看原文 |
| 关键词[WOS] | MAMMALIA |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Paleontology |
| WOS类目 | Paleontology |
| WOS记录号 | WOS:000227213000011 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.205/handle/311034/3581 |
| 专题 | 中科院古脊椎所（2000年以后） |
| 通讯作者 | Tong, HW (reprint author), Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, POB 643, Beijing 100044, Peoples R China. |
| 作者单位 | Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tong, HW,Tong, HW . Dental characters of the Quaternary tapirs in China, their significance in classification and phylogenetic assessment[J]. GEOBIOS,2005,38(1):139-150. |
| APA | Tong, HW,&Tong, HW .(2005).Dental characters of the Quaternary tapirs in China, their significance in classification and phylogenetic assessment.GEOBIOS,38(1),139-150. |
| MLA | Tong, HW,et al."Dental characters of the Quaternary tapirs in China, their significance in classification and phylogenetic assessment".GEOBIOS 38.1(2005):139-150. |
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