江西志留纪山口中华盔甲鱼的再描述
A redescription of the Silurian Sinogaleaspis shankouensis (Galeaspida, stem-Gnathostomata) from Jiangxi, China
摘要
Abstract
Sinogaleaspis shankouensis is redescribed based on 11 new specimens collected from the type locality of the Xikeng Formation in Xiushui county,Jiangxi Province.The in-depth morphological study indicates that the sensory canal system of S.shankouensis exhibits a mélange of characters of plesiomorphic galeaspid taxa,Eugaleaspiformes,Polybranchiaspiformes and Huananaspiformes.The grid distribution of the sensory canal system on the dorsal side of the head-shield,which comprises four longitudinal canals intercrossed with six pairs of transverse canals in S.shankouensis,probably represents a plesiomorphic condition of vertebrates.Sinogaleaspis shankouensis belongs to the Sinogaleaspis-Xiushuiaspis Fauna or the Maoshan Assemblage which represents the first diversification of galeaspids in the Telychian,Llandovery of the Silurian period.The sedimentary paleoenvironment of the Xikeng Formation in Xiushui,Jiangxi Province is suggestive of a brackish water environment,whereas a large sum of muddy gravels in fish-bearing sandstone beds point to a short distance of potamic transportation.This indicates that the Sinogaleaspis-Xiushuiaspis Fauna may live in a fresh water environment in the river rather than their burial area in the sea.关键词
江西修水/志留纪/真盔甲鱼目/中华盔甲鱼/侧线感觉管系统Key words
Xiushui, Jiangxi/Silurian/eugaleaspids, Sinogaleaspis/sensory canal system分类
生物科学引用本文复制引用
盖志琨,山显任,孙智新,赵文金,潘照晖,朱敏..江西志留纪山口中华盔甲鱼的再描述[J].古脊椎动物学报,2020,58(2):85-99,15.基金项目
中国科学院前沿科学重点研究计划(编号:QYZDB-SSW-DQC040,QYZDJ-SSW-DQC002)、国家自然科学基金(批准号:41572018,41530102,41972006)、国家高层次人才特殊支持计划(万人计划)、中国科学院战略性科技先导专项(编号:XDB26000000)、现代古生物学和地层学国家重点实验室(中国科学院南京地质古生物研究所)和“中国科学院大学生创新实践训练计划”项目资助.We are grateful to Zhao Ridong,Lin Xianghong,and Sun Baichuan for the great help in the field work,Guo Xiaocong,Yang Dinghua,and Huang Jinling for the illustrations and ecological restoration.This work was supported by Key Research Program of Frontier Sciences,CAS (QYZDB-SSW-DQC040,QYZDJ-SSW-DQC002),the National Natural Science Foundation of China (41572018,41530102,41972006),National Program for Support of Top-notch Young Professionals,and Strategic Priority Research Program of CAS (XDB26000000),State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology,CAS,No.193121) and Innovation Training Programs for Undergraduates,CAS. （编号:QYZDB-SSW-DQC040,QYZDJ-SSW-DQC002）
