美国哈佛大学Stephanie E. Pierce、底特律大学Nizar Ibrahim等研究人员合作发现,兽脚亚目恐龙具有可用于水上运动的尾部。该研究于2020年4月29日在线发表于《自然》。
据研究人员介绍,近几十年来,对非禽类恐龙的深入研究强烈表明,这些动物仅限于陆地环境。一些类群(如蜥脚类动物和鸭嘴龙)生活在水生环境中的猜想在几十年前就被放弃了。但最近有人争论说,至少一些棘龙类(白垩纪时期的大型肢体兽脚类群)是半水生的,但是这个理论在解剖学、生物力学和埋藏学方面受到了挑战,并且仍然存在争议。
附:英文原文
Title: Tail-propelled aquatic locomotion in a theropod dinosaur
Author: Nizar Ibrahim, Simone Maganuco, Cristiano Dal Sasso, Matteo Fabbri, Marco Auditore, Gabriele Bindellini, David M. Martill, Samir Zouhri, Diego A. Mattarelli, David M. Unwin, Jasmina Wiemann, Davide Bonadonna, Ayoub Amane, Juliana Jakubczak, Ulrich Joger, George V. Lauder, Stephanie E. Pierce
Issue&Volume: 2020-04-29
Abstract: In recent decades, intensive research on non-avian dinosaurs has strongly suggested that these animals were restricted to terrestrial environments1. Historical proposals that some groups, such as sauropods and hadrosaurs, lived in aquatic environments2,3 were abandoned decades ago4,5,6. It has recently been argued that at least some of the spinosaurids—an unusual group of large-bodied theropods of the Cretaceous era—were semi-aquatic7,8, but this idea has been challenged on anatomical, biomechanical and taphonomic grounds, and remains controversial9,10,11. Here we present unambiguous evidence for an aquatic propulsive structure in a dinosaur, the giant theropod Spinosaurus aegyptiacus7,12. This dinosaur has a tail with an unexpected and unique shape that consists of extremely tall neural spines and elongate chevrons, which forms a large, flexible fin-like organ capable of extensive lateral excursion. Using a robotic flapping apparatus to measure undulatory forces in physical models of different tail shapes, we show that the tail shape of Spinosaurus produces greater thrust and efficiency in water than the tail shapes of terrestrial dinosaurs and that these measures of performance are more comparable to those of extant aquatic vertebrates that use vertically expanded tails to generate forward propulsion while swimming. These results are consistent with the suite of adaptations for an aquatic lifestyle and piscivorous diet that have previously been documented for Spinosaurus7,13,14. Although developed to a lesser degree, aquatic adaptations are also found in other members of the spinosaurid clade15,16, which had a near-global distribution and a stratigraphic range of more than 50 million years14, pointing to a substantial invasion of aquatic environments by dinosaurs.
DOI: 10.1038/s41586-020-2190-3
Source: http://www.nature.com/articles/s41586-020-2190-3
期刊信息
Nature:《自然》,创刊于1869年。隶属于施普林格·自然出版集团,最新IF:43.07
官方网址:http://www.nature.com/
投稿链接:http://www.nature.com/authors/submit_manuscript.html