摘要
发现于贵州省瓮安和福泉县晚新元古代陡山沱期磷块岩中的一组可疑的磷酸盐化原生动物化石 ,暂定为 1新属——侧孔虫 (L uxapertus gen. nov.)。单房室壳体 ,卵形、球形及椭球形 ,磷酸盐化外壁 1- 2层 ,房室内分布磷酸盐化微粒和原生质 (?)残留物分布不均匀形成各种不规则斑纹。壳体前方一侧发育内口管的管状或乳头状口孔 ,管状口孔有清晰的丝状伪足伸出 ,其前端或壳体后方附有一团原生质 (?)残留物。上述特征表明这一类化石与有孔虫 (Foraminifera)似有明显的亲缘关系。根据标本的形态特征和口孔性质 ,本文初步记述了这批材料中的瓮安侧孔虫 (L uxapertus wenganensis gen.et sp. nov.)、球形侧孔虫 (L uxapertus sphaeroidolis gen.et sp.nov.)和乳头侧孔虫 (L uxapertus papillaformisgen. et sp.nov.)等三种侧孔虫新种 ,疑为地球早期原生动物的代表。这一发现丰富了瓮安生物群的内容 ,证明瓮安生物群中确有可疑的原生动物化石存在。一般认为有孔虫在寒武纪开始出现。瓮安生物群中可疑的有孔虫类的发现 ,使有孔虫首次出现的记录大大提前。
A well preserved microfossil group of possible Protozoa is discovered from Late Neoproterozoic Doushantuo phosphorites in Wengan-Fuquan area, Guizhou with a new genus Luxapertus gen. Nov.described. Phosphatized micrinites and protoplasm(?) distributed as irregular stripes in chamber. Aperture tubelike with internal siphon or papillar, at one side of the anterior of test. The tubelike aperture developed a filiform pseudopodia, with a group remains of protoplasm(?) at the front of the and the rear of test. The characteristics of the new genus suggest closest affinities with Foraminifera. On the basis of morphological characters and aperture features of these specimens, three new species are described Luxapertus wenganensis, Luxapertus sphaeroidolis and Luxapertus papillaformis for the representatives of possible early stage Protozoa on Earth. The discovery is not only enriching content of Wengan Biota but also providing evidence for possible Protozoa in it . As a general rule, Foraminifera appears in Cambrian, the discovery of a suspicious Foraminifera from Wengan Biota suggests an earlier origin.
出处
《微体古生物学报》
CSCD
北大核心
2004年第2期194-198,共5页
Acta Micropalaeontologica Sinica
关键词
原生动物
侧孔虫
陡山沱期
磷块岩
贵州
化石
晚新元古代
Protozoa, Luxapertus gen. nov., Late Neoproterozoic, Doushantuo Age, Phosphorite, Guizhou
