论文摘要
The Middle-Late Triassic succession of the Nimaigu Section（Wusha area, Xingyi City, Guizhou Province, South China） has yielded two exceptionally well-preserved marine vertebrate faunas, i.e.the Middle-Late Ladinian Xingyi Fauna and the overlying younger Carnian Guanling Biota, of which the former shows turnover of marine reptiles from coastal to oceanic environments.Herein, we report a newly discovered chondrichthyan fauna strata intermediate between the above mentioned vertebrate faunas.This chondrichthyan assemblage consists of one new genus of ‘pre-Jurassic Synechodus’（neoselachian）, one new genus closed to Omanoselache（hybodont shark）, Aff.Arctacanthus（chimaeroids?）, and some shark genera showing Palaeozoic affinities.The new genus of ‘pre-Jurassic Synechodus’ possesses a double-layered enameloid made of Single Crystallite Enameloid（SCE） and Parallel-Bundled Enameloid（PBE） and represents the first definitive record of a neoselachian shark from the Chinese Mesozoic so far.Another species is similar to Acrodus aff.spitzbergensis that was previously recorded from the Triassic of Japan, and which is certainly related to Omanoselache.The classification of Arctacanthus is still problematic because of its peculiar morphology.Several teeth display intermediate lateral cusplets, a basolabial depression and labial accessory cusplets, which would suggest affinities with Palaeozoic genera although this needs further investigation.
论文目录
文章来源
类型: 国际会议
作者: Jiachun LI,Zuoyu SUN,Cuny GILLES,Dayong JIANG
来源: 第一届亚洲古生物学大会—暨中国古生物学会成立90周年纪念 2019-11-17
年度: 2019
分类: 基础科学
专业: 生物学,地质学
单位: Peking University, Department of Geology and Geological MuseumUniversity Claude Bernard Lyon Laboratoire d’Ecologie des Hydrosystèmes Naturels et Anthropisés
分类号: Q915
页码: 82-83
总页数: 2
文件大小: 168k
下载量: 2