[关键词]
[摘要]
Duyunaspis Zhang and Qian in Zhou et al．，1977是黔东、湘西北杷榔组掘头虫类三叶虫的重要分子。本文描述剑河八郎“清虚洞组”的 Duyunaspis，这些新材料的头鞍中部膨大且向前略有收缩，前颊类型面线，成虫具10个胸节；而杷榔组的 Duyunaspis duyunensis Zhang and Qian in Zhou et al．，1977头鞍桶状，背沟较平直，后颊类型面线，成虫 10 个胸节，二者明显不同。本文将 “清虚洞组”的 Duyunaspis 定为一个新种：剑河都匀盾壳虫Duyunaspis jianheensis sp．nov．。研究显示，D．jianheensis与杷榔组的 D．duyunensis具有形态相似性，后者可能为其祖先种。
[Key word]
[Abstract]
A new oryctocephalid species Duyunaspis jianheensis sp. nov. is described from the Cambrian "Tsinghsutung Formation"(Series 2,Stage 4)at Songshan,Jianhe,eastern Guizhou,South China,revealing that the genus Duyunaspis ranges up from the slightly older Balang Formation(Cambrian Stage 4).The Balang Formation is widely exposed in the border area between eastern Guizhou and western Hunan and is dominated by oryctocephalids including Duyunaspis. Duyunaspis jianheensis sp.nov.is characterized by having aglabella that is more or less expanded at its mid-lengtha,aproparian suture,and a thorax with 10 segments in holaspids. Detailed exploration of ontogeny of D.jianheensis sp.nov.shows that the new species seems to be a descendent of Duyunaspis duyunensis of the Balang Formation.
[中图分类号]
[基金项目]
国家重点基础项目基金 (973 项目 )(2015FY310100-5)；国家重点自然科学基金 (41330101)；中国地质调查局地质调查项目(DD20160120-04)；国家自然科学基金(41772021，41662001，41702022)；现代古生物学和地层学国家重点实验室开放课题基金(173130)联合资助
