Taxonomy and Stratigraphy of Late Mesozoic Anurans and Urodeles from China
Taxonomy and Stratigraphy of Late Mesozoic Anurans and Urodeles from China
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DOI：
10.1111/j.1755-6724.2004.tb00774.x
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发表时间：
2004-12
期刊：
影响因子：
--
通讯作者：
Wang Yuan
中科院分区：
文献类型：
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作者：
Wang Yuan
摘要在中国东北地区晚中生代凝灰岩-湖相互层沉积（主要为热河群）中发现了3种无尾类（Callobatrachus sanyanensis、Liaobatrachus grabaui、Mabyryne beipiaoensis）和6种有尾类（Laccotriton subsolanus、Liaoxitriton zhongjiani、Jeholotriton paradoxus、Sinerpeton fengshanensis、Chunerpeton tianyiensis、Liaoxitriton daohugouensis）。它们记录了中国中生代利桑菲宾类的首次发现，其古老的地质时代、优越的保存条件和巨大的分类多样性与世界其他发现相比是独一无二的。无尾类的演化地位高于典型的侏罗纪类群，支持化石层位的后晚侏罗世时代。有尾目动物都有单头肋骨，表明在隐鳃类水平上的进化等级，并且在英格兰和中亚的中侏罗世和上侏罗世的非有尾目动物的骨骼学特征上先进。一些urodeles（Jeholotriton和Chunerpeton）表现出幼态特征，代表了这些发现中最早出现的。中国中生代已知的无尾两栖类化石层位有6个：道虎沟化石层、大北沟组、义县组陆家屯层、尖山沟层和大王杖子层、九佛堂组。根据骨骼学和化石发生学的研究，这些无尾类和有尾类的地质时代为早白垩世。
Abstract Three anurans (Callobatrachus sanyanensis, Liaobatrachus grabaui, Mesophryne beipiaoensis) and six urodeles (Laccotriton subsolanus, Liaoxitriton zhongjiani, Jeholotriton paradoxus, Sinerpeton fengshanensis, Chunerpeton tianyiensis, Liaoxitriton daohugouensis) are reported from the late Mesozoic tuff‐interbedded lacustrine deposits (mostly of the Jehol Group) in northeastern China. They document the first discovery of Chinese Mesozoic lissamphibians, and their old geological age, superb preservation condition, and large taxonomic diversity are unique compared with other findings worldwide. The anurans occupy a higher evolutionary position than typical Jurassic taxa, supporting a post‐Late Jurassic age of the fossil horizons. The urodeles all have unicapitate ribs, suggesting an evolutionary grade at the cryptobranchoid level, and are advanced in osteological features over non‐urodeles from the Middle and Upper Jurassic in England and Central Asia. Some urodeles (Jeholotriton and Chunerpeton) exhibit neotenic features, representing the earliest occurrence among such findings. Six fossil horizons are recognized for the known Chinese Mesozoic anurans and urodeles: the Daohugou fossil bed, the Dabeigou Formation, the Lujiatun Bed, Jianshangou Bed and Dawangzhangzi Bed of the Yixian Formation, and the Jiufotang Formation. As implied from the osteological and phylogenetical studies, the geological age of these anurans and urodeles is the Early Cretaceous.