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冠龙是一种生活于侏罗纪晚期的基干暴龙类,现已发现的化石皆产于中国新疆准噶尔盆地的石树沟组。本次研究使用激光非接触数据化仪对冠龙标本IVPP V14531的左手进行扫描,用RapidformXOV2软件建立单块骨骼三维数字模型,然后用AutodeskMaya软件关联手部各块骨骼,建立整个手部的功能性三维数字模型。尽管基于骨骼化石对兽脚类恐龙手指活动范围进行推测受制于一些不确定性因素,但我们还是能够给出手指的可能活动范围,来测算兽脚类恐龙手指的背展和屈曲度。对模型的分析显示,冠龙手指Ⅱ和Ⅲ的有限背展度介于基干僵尾龙高棘龙和虚骨龙类当中的恐爪龙之间,有限屈曲度变化范围很大,但在高棘龙和恐爪龙变化范围之内;手指Ⅳ的掌骨和指节间关节几乎没有活动性,第一个指节间关节背展度很大,甚至强于高棘龙,第二个指节间关节活动性和高棘龙相当,第三个指节间关节活动性和恐爪龙相当。这也许暗示兽脚类恐龙在演化过程中,手指背展能力逐渐减弱,而屈曲能力逐步加强。这一演化趋势是否存在还需要更多相关数据来检验。
Guanlong is a type of trunk tyrannosaur that lived in the late Jurassic. The fossils that have been found are all found in the Shishugou Formation of the Junggar Basin in Xinjiang, China. In this study, a laser non-contact data analyzer was used to scan the left hand of Corolla IVVP V14531. A single bone 3D digital model was created using RapidformXOV2 software. AutodeskMaya software was then used to correlate hand bones to establish the functionality of the entire hand Three-dimensional digital model. Although the fossil bones based on skeleton fossils speculate on the range of finger activity subject to some uncertainty, but we can still give the possible range of finger activity, to measure the foot-shaped dinosaur fingers back and flexion. The analysis of the model shows that the limited degree of retrusion of Guanlong fingers Ⅱ and Ⅲ is between that of Termitopodiaceae of the genus Agrimonia, which has a wide range of flexion. However, in the high Spinosaurus and fear claw dragon within the scope of change; finger metacarpophalangeal and interphalangeal joints almost no activity, the first interphalangeal joint dorsal degree is very large, even stronger than Asteraceae, the second knuckle Inter-articular activity and Acrocanthia considerable third inter-articular joint activity and fear claw quite. This may suggest that in the process of evolution of theropod dinosaurs, finger backprotecting ability gradually weakened, and the buckling ability gradually strengthened. The existence of this evolution trend also need more relevant data to test.