具实轴型中柱的皱纹珊瑚的分类位置至今尚未取得统一。这类珊瑚的轴部由纤状组织构成，它不同于复中柱或皱形复中柱，它的形成与主隔壁，对隔壁或一级隔壁内端没有关系，是皱纹珊瑚中一类独立发育的轴部构造。具实轴型中柱的珊瑚可以独立建立新目，称Ｃｙａｔｈａｘｏｎｉｉｄａ ｏｒｄ．ｎｏｖ．。按照组成实轴的纤状组织类型和实轴形态，可以划分为３科，即Ｃｙａｔｈａｘ－ｏｎｉｉｄａｅ ｅｄｗａｒｄｓ ｅｔ Ｈａｉｍｅ，１

The systematic position of the solid column of Rugosa has been a controversial i ssue for a long time. The solid column consists of fibrous tissue and clearly di ffers from the axial colum or protoaxial column. Its axial structure has no rela tionship with the cardinal septum or counter septum and inner ends of the septa. It is an independently developed axial structure in rugose coral. So, the Rugos a with solid column could constitute a new order Cyathaxoniida ord. nov. Ac cording to the unique fibrous tissue and the shape of solid column, this order c ould be further subdivided into three families: Cyathaxoniidae Edwards et Haime, 1850, Amygdalophyllidae Grabau, 1935 and Ekvasophyllidae Hill,1981. There are abundant solid column corals in Early Carboniferous of China. In this paper, three genera (including 1 new genus) and five species (including 4 new an d 1 uncertain species) are described. They were found from Datangian of Early Ca rboniferous in Qinghai and Yunnan provinces.

Q915.813.3