【作者】 赖才根；

【Author】 Lai Caigen (Institute of Geology,CAGS)

【机构】 中国地质科学院地质研究所；

【摘要】 本文描述了3属7种 Lituitids,划分 Lituitidae 科头足类为 Lituites,Sinoceras 和 Ancistroceras 三个属群,指出前二个属群多集中在 Llanvirn 晚期(牯牛潭晚期)由 Ancistroceras 属群派生而成．Ancistroceras 是最古老的 lituitids。作者还重新厘定了 Sinoceras 的属征,划分出 Sinoceras chinense 和 Sinoceras xinfiangense 二个种群,指出了他们各自的分布区域。更多还原

【Abstract】 Based on the literature and practical materials about Lituitidae,this paper deals with the distribution and phylogeny of Lituitidae and the diagnoses of genera in it.The fossil lituitids first appeared at the Late Arenig,distinctly developed at the late Llanvirn(the Late Guniutan stage),decreased its deve- lopment at the Late Caradoc(the Pagodan stage)and completely disappeared before the Middle Ashgill(the Wufengian stage).Their flourishing periods are very long in China,being restricted within base limits in Sweden and middle limits in Norway.更多还原