黔北晚奥陶世和早志留世四射珊瑚新资料

报道黔北早志留志中期（Middle Llandovery)地层中新发现的四射珊瑚7属--Cantrillia,Neocantrillia,Prototryplasma,Pycnostylus,Dalmanophyllum?.Rhegmaphyllum,Schlotheimophyllum,并描述产自黔东北石阡奥陶纪末期（Late Ashgill)观音桥层四射珊瑚2种--Grewingkia cf.bilateralis Neuman,Brachyelasma cf.medioseptatum(Neuman)及晚奥陶世（Early Ashgill期）涧草沟组中首次发现的四射珊瑚Crassilasma sp.。全文共描述四射珊瑚13属18种，其中6新种，它们是Crassilasma fenggangense sp.nov.,C.crebrumseptatum sp.nov.,Dinophyllum insolitum sp.nov.,Neocantrillia silurica sp.nov.,Prototryplasma guizhouense sp.nov.,Schlotheimophyllum regeneranum sp.nov.。

NEW INFORMATION ON LATE ORDOVICIAN AND EARLY SILURIAN RUGOSE CORALS IN NORTHERN GUIZHOU PROVINCE

genera of rugose corals are reported from the middle Llandovery in northern Guizhou Province of China for the first time. They are Cantrillia,Neocantrillia,Prototryplasma,Pycnostylus,Dalmanophyllum?, Rhegmaphyllum and Schlotheimophyllum. In addition, two species(Grewingkia cf. bilateralis(Neuman) and Brachyelasma cf. medioseptatum(Neuman) ) collected from the late Ashgill Guanyinqiao Beds in the Shiqian County of northern Guizhou Province, and one species(Crassilasma sp.)from the early Ashgill Jiancaogou (Jiantsaohou) Formation in the same area are described. These data enrich further the content of the Late Ordovician and Early Silurian rugose coral fauna in Yangtze region, and are considerably significant for study on origin, evolution and disperse of some Early Paleozoic rugose corals. Altogether 18 species assigned to 13 genera are described. Among them 6 species are new. They are Crassilasma fenggangense sp. nov., C. crebrumseptatum sp. nov., Dinophyllum insolitum sp. nov., Neocantrillia silurica sp. nov., Prototryplasma guizhouense sp. nov., and Schlotheimophyllum regeneranum sp. nov.