【作者】 王鸿祯； 何心一； 陈建强；

【Author】 Wang Hongzhen He Xinyi Chen Jianqiang (Beijing Graduate School,Wuhan College of Geology)

【机构】 武汉地质学院北京研究生部；

【摘要】 Pilophyllia Ge et Yü,1974是我国扬子区志留系中常见的属,在陕南宁强组中尤为丰富。该属为单体,隔壁为包珊瑚型,幼年期隔壁几乎全由层状组织组成,青年期以后隔壁核心为羽状组织外覆层状组织,横板大多完整平列或呈束状组合,具较宽的边缘厚结带。可能直接由 Amplexoides 演化而来。演化趋向主要表现为随层位的变化隔壁的层状组织逐渐被羽状组织所代替。根据隔壁类型和个体形态特征及出现时代先后．Pilophyllia 应归入包珊瑚科。它是该科中进化的一支,以发育复羽(?)为特征．文中描述了三个新种：Pilophyllia simplex Chen． P．alternata Chen,P．densitabulata Chen。更多还原

【Abstract】 The diagnosis of the genus is supplemented in terms of septal type and minute skeletal structures.The septa of Pilophyllia are clearly amplexoid,and are composed mainly of lamellar selerenchyme in the proximal part of the eorallum,but are characterized by development of trabeculae in the upper part.The outer part of septa in the peripheral stereozone are thick and con- tiguous,containing stout rhabdacanth trabeculae invested with lamellar tissue. The septa grow suddenly thin beyond the stereozone,but still comprise rha- bdacanth trabeculae that are developed upon the successive tabular floors.The clear boundary and evident difference between the juxtaposed and well-preser- ved lamellar and fibrous tissue as seen within the septa indicate that the idea of secondary origin of the lamellar structure of the skeleton is not tenable.更多还原