Abstract: The tooth-row fragment of a helicoprionid shark described in this paper wes collected in 1991 from Qixia Formation of Lower Permian in Xiandong, Lianyuan, Hunan. The specimen was found in a limestone intercalation of a set of black shales bearing Pseudohalorites (ammonites). The new material represents a new genus and new species.

摘要： 湖南涟源仙洞下二叠统栖霞组顶部新发现一段旋齿鲨类的齿列化石，经鉴定为一新属新种，命名为Hunanohelicoprion xiandongensis gen. et sp. nov.(仙洞湖南旋齿鲨)。新属兼有Sinohelicoprion(中国旋齿鲨)和Helicoprion(旋齿鲨)的某些重要特点，与前者的区别主要在于齿内有海绵状齿骨质层，与后者的区别主要在于齿冠侧翼之间几乎没有“无珐琅质层覆盖的间隙”，齿内有很发育的管状齿骨质层。在旋齿鲨科的系统演化过程中新属处于上述两已知属的过渡位置。