云南曲靖下泥盆统最大真盔甲鱼类漫游憨鱼再描述
Redescription of Nochelaspis maeandrine,the largest eugaleaspiform from the Lower Devonian of Qujing,Yunnan
摘要
Abstract
The new specimens of the largest eugaleaspiform Nochelaspis maeandrine are redescribed from two localities of the Xishancun Formation in Qujing City,Yunnan Province,southwestern China.Nochelaspis is most suggestive of Yunnanogaleaspis from the same horizon,but differs in its slit-like median dorsal opening(length/width＞6),much stronger inner cornual process,coarse stellate ornamentation,and the serrations along the edges of the median dorsal opening and headshield.The new findings reveal the morphological details on the ventral side of the headshield as well.The oralobranchial fenestra is covered by a large dermal ventral plate,which is decorated with dense,tiny granular tubercles,and aligned with six pairs of separated,large,and circular branchial openings.This condition is different from that of osteostracans,in which the oralobranchial fenestra is covered by numerous minute scales or larger dermal platelets,and the branchial openings are slit-shaped and covered by small skin flaps somewhat like those of elasmobranchs.However,the branchial openings of galeaspids and osteostracans are both located ventrally as in modern rays,indicating a benthic lifestyle dwelling on sandy or muddy substrates in a quiet marine environment.关键词
云南曲靖/早泥盆世/真盔甲鱼类/憨鱼属Key words
Qujing,Yunnan/Early Devonian/eugaleaspiform/Nochelaspis分类
生物科学引用本文复制引用
孟馨媛,朱敏,盖志琨..云南曲靖下泥盆统最大真盔甲鱼类漫游憨鱼再描述[J].古脊椎动物学报,2021,59(4):257-272,16.基金项目
国家自然科学基金(批准号:41972006,42072026)、中国科学院前沿科学重点研究计划(编号:QYZDB-SSW-DQC040)、国家高层次人才特殊支持计划(万人计划)和中国科学院战略性先导科技专项(编号:XDB26000000)资助.We are grateful to Zhao Ridong,Yi Chunjuan,Lin Xianghong,and Li Qiang for their hard fieldwork,Yang Dinghua for the illustrations(Fig.5)and ecological restoration(cover page).We especially appreciate the courtesy of Philippe Janvier permitting the illustration Fig.6D,F,Gerry De Iuliis and Dino Pulerà permitting the illustration Fig.6J,K,and Shigeru Kuratani permitting the illustration Fig.6I.This work was supported by Key Research Program of Frontier Sciences,CAS(QYZDB-SSW-DQC040),the National Natural Science Foundation of China(41972006,42072026),National Program for Support of Top-notch Young Professionals,and Strategic Priority Research Program of CAS(XDB26000000). （批准号:41972006,42072026）
