Sphenothallus Hall, 1847 from the Tsinghsutung Formation (Qiandongian Series, Cambrian) in Balang Village of Jianhe County, Guizhou Province, China
详细信息
- 责任者：Zhang Peixing (College of Resource and Environment Engineering ; Guizhou University ; Guiyang 550003 ; China) ; Zhao Yuanlong
- 刊名：Acta Micropalaeontologica Sinica
- 出版年：2013
- 卷期：30(3)
- 关键词：腔肠动物门 ; Coelenterata ; 贵州 ; Guizhou Province
- 页码：p.310-317
- 图表：3 illus., 2 tables, 30 refs.
- 分类号：1102
- issnNo：ISSN1000-0674
- isbnNo：CN32-1189/Q
摘要
The Tsinghsutung Formation(Qiandongian Series,Cambrian)of Songshan Section near Balang village,Jianhe County,Guizhou Province is mainly composed of limestone and mudstone,interbeded with mudstone and limestone in the upper part,and medium-bedded dolomite for the uppermost section.The upper part of the Tsinghsutung Formation belonging to the Redlichia(R.)guizhouensis-Redlichia(R.)nobilis Acme Zone is rich in ptychopariids,trilonites,mollusks and other invertebrate fossils including a few soft-body fossils.So far only 1 species,Sphenothallus cf.taijiangensis Zhu et al.,2000 has been found in this zone.A few well-preserved fossil specimens are described here with obvious annulations on the wall tube,indicating the Sphenothallus had conical-tubular skeleton.Sphenothallusfrom the Tsinghsutung Formation not only enriches the assemblage of the Tsinghsutung Formation biota,but also provides new material for the research of Sphenothallus.The preliminary study shows that a evolutionary trend exists for the lengthening individuals,widening longtitudinal thickenings,and diminishing apertual expandings.The Sphenothallus have affinities with polypoid hydrozoans or scyphozoans.
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