A NEW TROODONTID (DINOSAURIA, THEROPODA) BRAINCASE FROM THE DINOSAUR PARK FORMATION (CAMPANIAN) OF ALBERTA
文献类型：期刊论文
| 作者 | CURRIE, PJ; ZHAO, XJ |
| 刊名 | CANADIAN JOURNAL OF EARTH SCIENCES
 |
| 出版日期 | 1993-10-01 |
| 卷号 | 30期号:10-11页码:2231-2247 |
| 文献子类 | Article |
| 英文摘要 | A new, well-preserved specimen of Troodon formosus is the first to reveal the internal anatomy of the lower part of the braincase. In addition to providing new information on the brain of this highly encephalized dinosaur, the uncrushed bones clear up anatomical details left obscure by earlier studies. Computerized tomography (CT) scans reveal the nature of the inner ear and the course of the pneumatic ducts diverging from the middle ear. Evidence is presented to show that four of the five periotic pneumatic systems found in bird skulls are present in Troodon. The anterior tympanic recess is the most elaborate system, and diverticula from each side extend anteriorly, dorsally and, posteriorly from the middle ear. The posterior tympanic recess is located within the paroccipital process and the basioccipital, but the pneumatopore posterolateral to the stapedial recess is secondarily closed. The dorsal periotic sinus is represented by a smooth-surfaced concavity on the lateral surface of the prootic. The position of a pneumatic recess in this region is demonstrated by the presence of a pneumatopore in the quadrate. Diverticula from the anterior and posterior tympanic recesses are connected within braincase bones, and a possible pneumatopore in the prootic may connect these to the dorsal tympanic recess. The pneumatic condition of the troodontid articular is unknown. Contralateral connections of the sinus systems have been used to argue for a close relationship between birds and crocodiles, but their presence in this specimen suggests that they appeared more than once in archosaurs or that they are plesiomorphic for crocodiles, dinosaurs, and birds. Cranial pneumaticity cannot be used by itself to resolve the interrelationships of crocodiles, theropods, and birds, but other characters suggest derivation of birds from theropods. |
| WOS关键词 | CRANIAL ANATOMY ; BIRDS ; ORIGIN |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:A1993MW47200021 |
| 源URL | [http://124.16.247.212/handle/311034/7585]  |
| 专题 | 古脊椎动物与古人类研究所_古低等脊椎动物研究室 |
| 作者单位 | ACAD SINICA, INST VERTEBRATE PALEONTOL & PALEOANTHROPOL, BEIJING 100044, PEOPLES R CHINA |
| 推荐引用方式 GB/T 7714 | CURRIE, PJ,ZHAO, XJ. A NEW TROODONTID (DINOSAURIA, THEROPODA) BRAINCASE FROM THE DINOSAUR PARK FORMATION (CAMPANIAN) OF ALBERTA[J]. CANADIAN JOURNAL OF EARTH SCIENCES,1993,30(10-11):2231-2247. |
| APA | CURRIE, PJ,&ZHAO, XJ.(1993).A NEW TROODONTID (DINOSAURIA, THEROPODA) BRAINCASE FROM THE DINOSAUR PARK FORMATION (CAMPANIAN) OF ALBERTA.CANADIAN JOURNAL OF EARTH SCIENCES,30(10-11),2231-2247. |
| MLA | CURRIE, PJ,et al."A NEW TROODONTID (DINOSAURIA, THEROPODA) BRAINCASE FROM THE DINOSAUR PARK FORMATION (CAMPANIAN) OF ALBERTA".CANADIAN JOURNAL OF EARTH SCIENCES 30.10-11(1993):2231-2247. |
入库方式： OAI收割
来源：古脊椎动物与古人类研究所
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