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Phosphatized multicellular algae in the Neoproterozoic Doushantuo Formation, China, and the early evolution of florideophyte red algae
Xiao, SH; Knoll, AH; Yuan, XL (袁训来); Pueschel, CM
2004-02-01
Source PublicationAMERICAN JOURNAL OF BOTANY
ISSN0002-9122
Volume91Issue:2Pages:214-227
Abstract

Phosphatic sediments of the Late Neoproterozoic (ca. 600 million years old [Myr]) Doushantuo Formation at Weng'an, South China, contain fossils of multicellular algae preserved in anatomical detail. As revealed by light microscopy and scanning electron microscopy, these fossils include both simple pseudoparenchymatous thalli with apical growth but no cortex-medulla differentiation and more complex thalli characterized by cortex-medulla differentiation and structures interpretable as carposporophytes, suggesting a multiphasic life cycle. Simple pseudoparenchymatous thalli, represented by Wengania, Gremiphyca, and Thallophycoides, are interpreted as stem group florideophytes. In contrast, complex pseudoparenchymatous thalli, such as Thallophyca and Paramecia, compare more closely to fossil and living corallinaleans than to other florideophyte orders, although they also differ in some important aspects (e.g., lack of biocalcification). These more complex thalli are interpreted as early stem group corallinaleans that diverged before Paleozoic stem groups such as Arenigiphyllum, Petrophyton, Graticula, and Archaeolithophyllum. This phylogenetic interpretation implies that (1) the phylogenetic divergence between the Florideophyceae and its sister group, the Bangiales, must have taken place before Doushantuo time-an inference supported by the occurrence of bangialean fossils in Mesoproterozoic rocks; (2) the initial diversification of the florideophytes occurred no later than the Doushantuo time; and (3) the corallinalean clade had a "soft" (uncalcified) evolutionary history in the Neoproterozoic before evolving biocalcification in the Paleozoic and undergoing crown group diversification in the Mesozoic.

KeywordCorallinales Florideophyceae Neoproterozoic Rhodophyta South China
Language英语
WOS KeywordGenus Sporolithon Sporolithaceae ; South China ; Bangiophycidae Rhodophyta ; Hildenbrandia Rhodophyta ; Snowball Earth ; Pit Plugs ; Phylogeny ; Fossils ; Preservation ; Corallinales
WOS Research AreaPlant Sciences
WOS SubjectPlant Sciences
WOS IDWOS:000189147900007
PublisherBOTANICAL SOC AMER INC
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/1054
Collection中国科学院南京地质古生物研究所
其他
Corresponding AuthorXiao, SH
Affiliation1.Virginia Polytech Inst & State Univ, Dept Geol Sci, Blacksburg, VA 24061 USA
2.Harvard Univ, Bot Museum, Cambridge, MA 02138 USA
3.Chinese Acad Sci, Nanjing Inst Geol & Paleontol, Nanjing 210008, Peoples R China
4.SUNY Binghamton, Dept Biol Sci, Binghamton, NY 13901 USA
Recommended Citation
GB/T 7714
Xiao, SH,Knoll, AH,Yuan, XL ,et al. Phosphatized multicellular algae in the Neoproterozoic Doushantuo Formation, China, and the early evolution of florideophyte red algae[J]. AMERICAN JOURNAL OF BOTANY,2004,91(2):214-227.
APA Xiao, SH,Knoll, AH,Yuan, XL ,&Pueschel, CM.(2004).Phosphatized multicellular algae in the Neoproterozoic Doushantuo Formation, China, and the early evolution of florideophyte red algae.AMERICAN JOURNAL OF BOTANY,91(2),214-227.
MLA Xiao, SH,et al."Phosphatized multicellular algae in the Neoproterozoic Doushantuo Formation, China, and the early evolution of florideophyte red algae".AMERICAN JOURNAL OF BOTANY 91.2(2004):214-227.
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