Systematic description and phylogenetic affinity of tubular microfossils from the Ediacaran Doushantuo Formation at Weng
Liu, Pengju1; Xiao, Shuhai (肖书海)2; Yin, Chongyu1; Zhou, Chuanming (周传明)3; Gao, Linzhi1; Tang, Feng1
2008
发表期刊PALAEONTOLOGY
ISSN0031-0239
卷号51期号:Part 2页码:339-366
摘要

This paper provides a systematic treatment of tubular microfossils collected from dolomitic phosphorites of the Ediacaran Doushantuo Formation at Weng'an, South China. These microfossils were investigated using petrographic, acid extraction and re-embedding techniques. Four morphological genera and five morphospecics are described: Ramitubus increscens gen. et sp. nov., Ramitubus decrescens gen. et sp. nov., Sinocyclocyclicus guizhouensis, Quadratitubus orbigoniatus, and Crassitubus costatus gen. et sp. nov. They are characterized by cylindrical (R. increscens, R. decrescens, S. guizhouensis and C. costatus) or tetragonal (Q. orbigoniatus) tubes with closely spaced cross-walls. Ramitubus has mostly complete cross-walls, whereas all other taxa have regularly intercalated complete and incomplete cross-walls. Some of them branch dichotomously (R. increscens and R. decrescens), others have a longitudinal ridge running along a curved tube (C. costatus). The palaeoecology, ontogeny, and phylogenetic affinity of these microfossils are still uncertain. They probably represent non-biomineralizing organisms in the Ediacaran ocean. Ramitubus (and possibly all other morphotaxa described in this paper) was probably benthic and grew unidirectionally and episodically. The incomplete cross-walls could have been formed through terminal addition or, alternatively, through intercalary insertion. It is possible that some or all morphotaxa described may represent ontogenetic or ecophenotypic variations of one or a few closely related biological species. If so, then the combination of morphological features (complete and incomplete cross-walls, tetra-radial symmetry, and longitudinal ridge) can negate a cyanobacterial or algal interpretation, and point to a ternative cnidarian affinity.

关键词Ediacaran Doushantuo Formation South China Tubular Microfossil Cnidarian Cyanobacterium
DOI10.1111/j.1475-4983.2008.00762.x
语种英语
关键词[WOS]Animal Embryos ; Cambrian Coral ; Pb Ages ; Fossils ; Evolution ; Constraints ; Biota ; Platysolenites ; Preservation ; Phosphorites
WOS研究方向Paleontology
WOS类目Paleontology
WOS记录号WOS:000254486400006
出版者BLACKWELL PUBLISHING
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/177
专题中国科学院南京地质古生物研究所
其他
作者单位1.Chinese Acad Med Sci, Inst Geol, Beijing 100037, Peoples R China
2.Virginia Polytech Inst & State Univ, Dept Geosci, Blacksburg, VA 24061 USA
3.Nanjing Inst Geol & Paleontol, State Key Lab Paleobiol & Straitg, Nanjing 210008, Peoples R China
推荐引用方式
GB/T 7714
Liu, Pengju,Xiao, Shuhai ,Yin, Chongyu,et al. Systematic description and phylogenetic affinity of tubular microfossils from the Ediacaran Doushantuo Formation at Weng[J]. PALAEONTOLOGY,2008,51(Part 2):339-366.
APA Liu, Pengju,Xiao, Shuhai ,Yin, Chongyu,Zhou, Chuanming ,Gao, Linzhi,&Tang, Feng.(2008).Systematic description and phylogenetic affinity of tubular microfossils from the Ediacaran Doushantuo Formation at Weng.PALAEONTOLOGY,51(Part 2),339-366.
MLA Liu, Pengju,et al."Systematic description and phylogenetic affinity of tubular microfossils from the Ediacaran Doushantuo Formation at Weng".PALAEONTOLOGY 51.Part 2(2008):339-366.
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