古脊椎动物学报（中英文）2024，Vol.62Issue(4)：245-261,17.DOI:10.19615/j.cnki.2096-9899.240820
重庆特异埋藏化石库盔甲鱼类一新属
Anew genus of galeaspids(jawless stem-Gnathostomata)from the early Silurian Chongqing Lagerstätte,China
摘要
Abstract
The early Silurian Chongqing Lagerstätte(middle Telychian)yields exceptionally preserved articulated jawless and jawed fishes.Here,we describe a new eugaleaspiform(Galeaspida,jawless stem-Gnathostomata),Miaojiaaspis dichotomus gen.et sp.nov.,from the Chongqing Lagerstätte in Xiushan,Chongqing,China.The new form resembles Tujiaaspis vividus in the short medial dorsal canal,and the presence of the branching ends of the lateral transverse canal.They differ in that T.vividus has highly developed subordinate branches of the sensory canals that form a reticulate sensory canal system,and the median dorsal opening is more elongated.Our phylogenetic analysis recovers M.dichotomus and T.vividus as a monophyletic clade(Tujiaaspidae fam.nov.),which is supported by two synapomorphies:the short medial dorsal canal,and the branching ends of the lateral transverse canal.Tujiaaspidae forms a trichotomy with Shuyuidae and a clade comprising Anjiaspis,Sinogaleaspidae,Yongdongaspidae,and the'eugaleaspid cluster'.The sensory canal patterns in galeaspids are compared to show the transformation sequence of the sensory canal system in Eugaleaspiformes.关键词
重庆特异埋藏化石库/特列奇期/盔甲鱼亚纲/形态学/系统学Key words
Chongqing Lagerstätte/Telychian/Galeaspida/morphology/phylogeny分类
生物科学引用本文复制引用
陈阳,李强,周政达,山显任,朱幼安,王倩,魏光飚,朱敏..重庆特异埋藏化石库盔甲鱼类一新属[J].古脊椎动物学报（中英文）,2024,62(4):245-261,17.基金项目
国家自然科学基金(批准号:42002015)、重庆市技术创新与应用发展专项重点项目(编号:CSTB2023TIAD-KPX0098)、重庆市科研机构绩效激励引导专项(编号:cstc2022jxj100008)、重庆市规划和自然资源局古生物化石等地质遗迹保护与研究专项和重庆地质矿产研究院科研平台开放课题(编号:CKLEMME-202201)资助. （批准号:42002015）
