贵州西部下石炭统赵家山组异珊瑚

HETEROCORALS FROM THE ZHAOJIASHAN FORMATION, LOWER CARBONIFEROUS, WESTERN GUIZHOU PROVINCE

本文描述了贵州西部下石炭统赵家山组异珊瑚类5个属,22个种,4个未定种,其中包括1个新属,11个新种。文中还根据异珊瑚类后生隔壁发育的特点,化石保存和埋藏的特征等,系统论述了异珊瑚类的分类和生态。

The Heterocorals collected from the dark-grey limestone of the upper part of the Lower Carboniferous Zhaojiashan Formation in Weining area, Guizhou, are described in this paper.There are 27 species of 5 genera of them, among which 1 genus and 12 species being new. Both the family Hexaphylliidae and subfamily Hexaphylliinae are new-built.On the basis of the characteristics of the metasep-ta, a more systematic classification of the Heterocorals is made and its implication is redefined. According to the characteristics of burial and preservation of the fossils, the ecology is discussed as well.Descriptions of new family, new subfamily and new genusjFamily Hexaphylliidae fam. nov.The corallum is solitary,slender and columnar.There are 5, 6 or 7septa, 4 of them forming two '丫' figures in traverse direction.Outward, the septa project out of the body wall, forming longitudinal ridges often bearing with nodules or spines; inward, they intersect or curve into an aulos at the centre. The tabulae are complete and domed upward, with their downing margins forming tabula walls.Geologic times Visean.Subfamilly Hexaphylliinae subfam. nov.There are 5,6 or 7 septa intersecting at the centre.Geologic time:Visean.Genus Haptaphyllia gen.nov.Type specios: Haptaphyllia asiatica gen.et sp.nov.Diagnosis. The corallum is rather large and ellipticalcolumnar, epitheca is thick.There are 7 septa, dividing the body cavity into 7 areas. Traversely, there are 4 septa forming two 'V' figures and longitudinally two septa form one 'V figure. And the Vsintersect crosswise with another septum at the center of the thecarium.Tabulae are perfect and domed upward.Time and distribution: Visean, China and Japan.