【摘要】 <正> 一前言尖笔石类的笔石在亚洲、欧洲及北美洲早志留世地层中分布广泛。由于这类笔石层位稳定,一直当作下志留统重要的标准化石,并用来建立笔石带,进行地区间及世界范围的对比。虽然自1867年就开始对这类笔石进行研究,但直到目前,对这类笔石的始端性质及发育型式,还没有完全搞清楚,因而对其系统分类位置的认识一直未能得到令人满意的结果。这对于进一步研究此类笔石的发生、演化及其系统分类更多还原

【Abstract】 The present paper gives a brief account of the development type and systematic position of Akidograptids, 9 species and subspecies are described from Upper Ordovician and Lower Silurian, of which 7 species and subspecies are new. According to the thecal character, the Akidograptids may fall into two genera, namely Akidograptus Davies, 1929, and Parakidograptus (gen. nov.). Both the genera are included in the new subfamily Akidograptinae, belonging to the Diplograptidae Lapworth, 1873.更多还原