三叠纪幻龙研究进展及存在的问题
Research Progress and Unsolved Problems of Triassic Nothosaurus

摘要 随着欧洲及中国华南三叠纪地层中具有头后骨骼的幻龙属新材料的发现, 幻龙属的研究近年取得新进展。通过分析前人对幻龙属内各物种的分类学沿革、地层发生顺序及古地理分布的研究, 认为幻龙最早出现于安尼期早期, 在安尼期晚期至拉丁期早期达到繁盛期, 在卡尼期早期绝灭。结合幻龙属的分支谱系分析, 认为其可能的迁移路线为: 在欧洲, 由荷兰迁移至德国和以色列。关于幻龙最早出现于西特提斯还是东特提斯, 目前尚无定论。
Abstract Recently, with the discovery of many complete materials, some progress has been made among the researches of Nothosaurus. Based on the detailed analyses of the present progress in taxonomic, paleogeographic distribution and stratigraphic occurrences, the history of Nothosaurus has been confirmed: first appeared in the early Ainsian, flourished from late Ainsian to early Ladinian, and extincted in early Carnian. Furthermore, from the recent phylogenetic analyses, a possible immigration pathway of Nothosaurus is suggested: from the Netherlands to Germany and Israel in Europe, but it is uncertain whether the genus originated from the western or eastern Tethys.