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Ordovician marine Charophyceae and insights into land plants derivations
ID：109 View Protection：ATTENDEE Updated Time：2025-05-21 16:49:51 Hits：215 Oral Presentation

Start Time：Pending（Asia/Shanghai）

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Abstract
The emergence of land plants was a pivotal development in Earth history. It has been postulated that the evolutionary transition from freshwater streptophyte algae to land plants, or canalization of plant meiosis, was completed during the Middle Ordovician (~460 Ma). However, the absence of undisputed streptophyte algal fossils (e.g., Charophyceae) earlier than late Silurian (~425 Ma) has obscured this link between streptophyte algae and land plants. Here we describe a marine Charophyceae fossil, Tarimochara miraclensis gen. et sp. nov., from early and middle Katian (Late Ordovician, ~453–449 Ma) marine limestones in northwestern China. This discovery demonstrates that at least some species of Charophyceae inhabited shallow normal marine environments at that time. Moreover, these early Charophyceae show that some key morphological innovations associated with an evolutionary transition between streptophyte algae and land plants had occurred prior to the early Katian. This provides crucial evidence relevant to land plant origins.

 
Keywords
Ordovician,Charophyceae,land plant,carbonate,Tarim,Ordos
Speaker
Lijing Liu
associate professor State Key Laboratory of Continental Evolution and Early Life, Shaanxi Key Laboratory of Early life and Environment, Department of Geology, Northwest University

Submission Author
Lijing Liu State Key Laboratory of Continental Evolution and Early Life, Shaanxi Key Laboratory of Early life and Environment, Department of Geology, Northwest University
Jian Han 西北大学
Zhifei Zhang State Key Laboratory of Continental Evolution and Early Life, Shaanxi Key Laboratory of Early life and Environment, Department of Geology, Northwest University
Qing Tang 南京大学
Ke Pang 中国科学院南京地质古生物研究所
Ruiyun Li 西北大学
Yasheng Wu Key Laboratory of Petroleum Resource Research, Institute of Geology and Geophysics, Chinese Academy of Sciences
洪 华 西北大学
Bin Guo 西北大学
Chunfang Cai 中国科学院地质与地球物理研究所
Robert Riding Department of Earth and Planetary Sciences, University of Tennessee
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Important Date

  • Conference Date

    Jun 10

    2025

    to

    Jun 13

    2025

  • Apr 15 2025

    Draft paper submission deadline

Sponsored By
National Natural Science Foundation of China
Geobiology Society
National Committee of Stratigraphy of China
Ministry of Science and Technology
Geological Society of China
Paleontological Society of China
Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences (CAS)
Institute of Vertebrate Paleontology and Paleoanthropology, CAS
International Commission on Stratigraphy
International Paleontological Association
Organized By
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (CUG, Wuhan)
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