甘肃迭部早石炭世异珊瑚的发现及Radiciphyllia的微细构造

DISCOVERY OF LOWER CARBONIFEROUS HETEROCORALS IN TEWO AREA,GANSU PROVINCE AND MICROSTRUCTURES OF RADICIPHYLLIA

本文描述早石炭世异珊瑚类５属６种，包括ＨｅｘａｐｈｙｌｌｉａｆｌｏｒｉｆｏｒｍｉｓＷａｎｇｅｔＹｅ，Ｈｅｔｅｒｏｐｈｙｌｌｉａｔｅｗｏｅｎｓｉｓ（ｓｐ．ｎｏｖ．），Ｈｅｔｅｒｏｐｈｙｌｌｏｉｄｅｓｃｆ．ｙｕｎｎａｎｅｎｓｉｓ（Ｄｕａｎ），Ｆｏｓｓｏｐｈｙｌｌｉａｓｐ，，Ｒａｄｉｃｉｐｈｙｌｌｉａｇｉｇａｎｔｅａ（ｓｐ．ｎｏｖ．）．以上标本产自甘肃法部益哇沟、东支沟部面下石炭统大塘价上部，此外Ｒａｄｉｃｉｐｈｙｌｌｉａｓｐ．产自益哇沟下石炭统德坞阶．笔者对Ｒａｄｉｃｉｐｈｙｌｌｉａｇｉｇａｎｔｅａ个体的骨骼微细构造进行扫描电镜研究，其隔壁、横板、外壁均为纤状组织，并由短轴晶柱及晶粒组成．本文还简要讨论Ｒａｄｉｃｉｐｈｙｌｌｉａ的分类位置及其亲缘演化关系．

he new materials of Lower Carboniferous heterocorals were collected from Yiwagou and Tongzhigou sections,Tewo County,Gansu Province.The authors have described 5 genera and 6 species including 2 new species HeterophyUI'a tewoensis(sp.nov.)and Radiciphyllia gigantea(sp.nov.).The skeletonal microstructures of genus Radiciphyllia are all made up of fibrous elements,in which the wall,septa and tabulae are mainly composed of brachycolumns and rare crystal-granules based on electron microscope observation of Radiciphyllia gigantea(sp.nov.) from Yiwagou,Tewo County.These structures of septal edges show well the rooted or embedded character into the wall.By using SEM observation,the allthors recognize the rooted structures,which are made up of brachycolumns and crystal granules.Description of new species Order Heterocorallia Schindewolf,1941 Family Heterophyllidae Dybowski,1873 Genus HeterophyUia M'Coy,1849 HeterOPhyllia tewoensis sp.nov.P1.1,figs.5-7 Description:Solitary coral with ovaal or elliptical outline in transverse section,coral lite has longer diameter of 7 mm and shorter ones of 5～6 mm.Sepia 2～-24 in number,they are arranged in four bundle,four protosepta forming two y-form sepia in the central area.Wall thick,0.5～0.6 mm in width,in the transverse section with more numerous tabulae sectional line.Comparison:This new species is similar to Heterophyllia ornata M'Coy described by Poty,E.(1978),but it differs in having larger diameter of corallite and more straight septa.Occurrence and Horizon:Lower Carboniferous Upper,Tatang Stage,Dongzhigou,Tewo County,Gansu Province.Family Longlinophyllidae Lin et Wu,1985Genus RadiciphyUia Sugiyama,1984Radiciphyllia gigantea sp. nov.P1.1,figs.1～2,10-11,P1.2,figs.1-8Description:Solitary cylindrical,the diameter of the largest corallite being 15 mm.Inadult stage,sepia 30～31 in number,most of which extending to the center and connectedwith each other,but shorter sepia frequently became free. Tabulae are almost complete,strongly convex,but in the middle slightly concave,there are 13-14 tabulae in a verticaldistance of 5 mm.Comparison:By having large corallite(15 mm in diameter) numerous sepia and strongly dilated in peripheral edges normally continuous laterally,this new species may be distinguished from the other species of the same genus.Occurrence and Horizon:Lower Carboniferous,Upper Tatang Stage,Yiwagou,Tewo County,Gansu Province