【摘要】 描述产于贵州剑河八郎苗板坡剖面凯里组的艾苏贝一新种。新种腹壳壳喙细小尖凸,最高点位于壳喙处,两壳壳面具细圆且低小的放射线,放射线之间的间隔宽度与放射线的宽度相当,放射线上具有数量多、密度大、个体小的瘤点,为此建立新种瘤点艾苏贝(Nisusia granosasp.nov.)。凯里生物群中产有丰富的腕足动物化石,新种瘤点艾苏贝的发现增加了凯里生物群腕足类的分异度,为研究寒武纪腕足动物的辐射和多样性提供了重要的证据,也为研究艾苏贝类形态特征及钙质壳腕足动物壳面装饰在泥页岩中形态的变化和系统分类提供新的材料。更多还原

【Abstract】 A new species of Nisusia collected from the Kaili Formation at Miaobanpo section,Balang village,Jianhe County,Guizhou Province is described here as Nisusia granosa sp.nov..The detailed study of Nisusia granosa sp.nov.reveals that it bears similar morphological features like the species of Nisusia.But,the new species contains the tiny,highly pointed peak which forms the highest point of the ventral shell.Also it presents low rounded costellae with small tubercles on the shell.The spaces between costellae are almost equivalent to the thickness of each of them.All these characters which are significantly different from other species of Nisusia,suggest it’s reference to a new species of Nisusia.The new discovery of Nisusia granosasp.nov.not only enriches the understanding of brachiopod community of Kaili Biota,but also provides new material for researching on the ornamentation-variations and morphology of Nisusiashells,as well as the phylogeny of the Nisusiaclade in the future.更多还原