贵州遵义下寒武统牛蹄塘组生物群中的海绵化石

遵义松林中南村下寒武统牛蹄塘组中下部，特别是下部黑色泥岩中产有大量的海绵骨针，形态多样，初步研究有多达10属以上的海绵动物，与澄江生物群的海绵相比，牛蹄塘组的海绵动物化石其组合特征以六射海绵动物为主，它的发现增添了寒武纪生物组成的信息，为海绵动物从晚新元古代的发生以至穿越寒武纪的演化过程及寒武纪生物大爆发的定性，量度提供了重要信息及资料，描述了4属2个种。1个相似种和1个未定种。Hyalosinica sp.;Saetaspongia densa Mehl et Reitner,1993;Leptomitus teretiusculus CHen,Hou et Lu.1989;Crumillospongia cf.biporosa Righy,1986，它们分属于海绵动物的六射海绵纲和普通海绵纲。

Sponges of the Lower Cambrian Niutitang Formation Biota in Zunyi,Guizhou,China

A lot of Spicules were found by M.Steiner,E.Wallis,Zhao Yuanlong,Guo Qingjun et al.in the Lower Cambrian Niutitang Formation at Songlin town of Zunyi area,especially under the black mudstone.Their patterns are abundant,and according to a prelimmary estimate,there are more than ten genus' Poritera.Compared with the composite characteristics of Poritera in the Chengjiang biota,they are mainly Hexactinellia in the Niutitang Formation.These discoverings increase information about oraganism's composing in Cambrian and provide lots of important information and material for sponges appearance from late Precambrian and evolution cutting acros Cambrian and the definition of the Cambian Explosion.Here are described four genus,two species (Saetaspongia densa Mehl et Reitner,in steiner et al.,1993;Leptomitus teretiusculus Chen,Hou et Lu,1989),a cf.species (Crumillospongia cf.biporosa Righy,1986) and a sp.species (Hyalosinica sp.) which belong to Hexactinellida Schmidt and Demospongea Sollas.