滇东曲靖地区晚志留世四射珊瑚动物群

LATE SILURIAN RUGOSE CORAL FAUNA FROM THE QUJING DISTRICT, EAST YUNNAN

对滇东曲靖地区晚志留世 (Ludlow晚期—Prodoli早期 )四射珊瑚群详细研究并对某些珊瑚属种作了修订。文中特别对关底组和妙高组的珊瑚群特征及其分布加以论述。滇东曲靖地区晚志留世四射珊瑚共有 2 2属 ,4 4种 (包括关底组、妙高组与玉龙寺组产的珊瑚 )。其中泡沫珊瑚类Holmophyllum ,Cystiphyllum和Ketophyllum占优势 ,其次是柱珊瑚类Kyphophyllum ,Micula和Pilophyllum等属 ,而扭心珊瑚类代表很少 ,仅有Brachyelasma ,Rukhinia和Phaulactis属首次发现在滇东晚志留世地层中。滇东曲靖地区晚志留世四射珊瑚群与西秦岭同期四射珊瑚有密切联系 ,同时 ,与乌拉尔 (Ural)同期珊瑚群也有些相似。文中共描述四射珊瑚 17属 ,2 3种 ,其中 3新种 ,即Cystiphyllumminutumsp .nov .,Ketophyllum qujingensesp .nov .,Phaulactisvesicularissp .nov .。

Late Silurian(Late Ludlow-Early Pridoli)rugose coral fauna from the Qujing district, east Yunnan are studied in detail, and some rugosan genera and species are reviewed, especially the coral fauna characters and their distribution of the Guandi Formation and Miaogao Formation are discussed. Altogether 22 genera and 44 species of rugose occurred in Late Silurian( including Guandi, Miaogao and Yulongsi formations) of Qujing, east Yunnan(see Tables Ⅰ,Ⅱ). Among them, cystiphylloids Holmophyllum, Cystiphyllum and Ketophyllum are dominant. The columnariids Kyphophyllum, Micula and Pilophyllum and others are present. While the representatives of streptelasmatids are rare, only three genera Brachyelasma, Rukhinia and Phaulactis have been found for the first time from east Yunnan. As a whole, the Late Silurian rugosan fauna of east Yunnan has an affinity with contemporary west Qinling forms, and shows to a centain extent similarity to those of contemporaneous beds of Ural. Altogether 23 species comprising 17 genera of rugosa are described, among them 3 species are new, namely Cystiphyllum minutum sp. nov., Ketophyllum qujingense sp. nov. and Phaulactis vesicularis sp. nov.