疑源类Tianzhushania在贵州瓮安震旦纪陡山沱组磷块岩中的发现

首次报道贵州瓮安地区震旦系陡山沱组磷块岩中的大型具刺凝源类Tianzhushania spinosa及其新种Tianzhushania tuberifera sp.nov.前者形态特征及内部结构与湖北峡尔地区震旦系陡山沱组隧石结核中发现的典型Tianzhushania spinosa 标本（硅化）完全相同，但多数未遭受重力挤压呈球形保存。新种特征明显，也呈球形保存，但内层表面具有明显瘤突，瘤突顶端向外延伸出单一或多条管状制，另外还探讨大型具刺疑源类Tianzhushania属的特征，已定种的地理分布，地层意义和亲缘关系。

DISCOVERY OF TIANZHUSHANIA IN DOUSHANTUO PHOSPHORITES IN WENG'AN, GUIZHOU PROVINCE

The large acanthomorphic acritarch Tianzhushania spinosa (Yin L et Li) Yin C(1988) and a new species Tianzhushania tuberifera sp. nov. are first described from the Doushantuo phosphorites in Weng'an, Guizhou Province. The former is usually preserved as globoids and their morphological character and inner structure are quite similar to those typical Tianzhushania spinosa (silicified) found in chert of the Sinian Doushantuo Formation in eastern Yangtze Gorges, Hubei Province. The distinct new species, preserved as globoids too, shows a dense inner wall with distinctly uniform tubers and stretching out one or more tube like processes. The phosphatized Tianzhushania found in Weng'an further confirms that the fossiliferous horizons in Guizhou and eastern Yangtze Gorge are coeval, which provides a new datum for studying those phosphatized spheroidal fossils.