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New materials of acanthomorphic acritarchs from the Ediacaran Weng'an Biota (South China)

Published online by Cambridge University Press:  31 May 2024

Junxian Wu ,
Weichen Sun ,
Xiaodong Shang Open the ORCID record for Xiaodong Shang [Opens in a new window] ,
Pengju Liu ,
Maoyan Zhu  and
Zongjun Yin Open the ORCID record for Zongjun Yin [Opens in a new window]
Junxian Wu
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
Weichen Sun
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
Xiaodong Shang
Affiliation:
MNR Key Laboratory of Stratigraphy and Palaeontology, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
Pengju Liu
Affiliation:
MNR Key Laboratory of Stratigraphy and Palaeontology, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
Maoyan Zhu
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China Nanjing College, University of Chinese Academy of Sciences, Nanjing 211135, China
Zongjun Yin*
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China Nanjing College, University of Chinese Academy of Sciences, Nanjing 211135, China
*
*Corresponding author.
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Abstract

The Weng'an Biota from the Ediacaran Doushantuo Formation in Guizhou Province, southwestern China, is known for its three-dimensionally phosphatized acritarchs, multicellular algae, and embryo-like animal fossils. Among these diverse microfossils, acanthomorphic acritarchs have played a significant role in the biostratigraphic subdivision and correlation of the lower-middle Ediacaran System. However, most previous studies on the biostratigraphy of the Doushantuo Formation in the Weng'an area have focused on large acanthomorphic acritarchs (LAAs, vesicle diameter >200 μm), whereas the smaller acanthomorphic acritarchs (SAAs, vesicle diameter <100 μm) from the Weng'an Biota have been largely overlooked. In this study, we examined >500 thin sections and discovered a large number of well-preserved, small (<100 μm) and medium-sized acanthomorphic acritarchs (MAAs, vesicle diameter ranging 100–200 μm). In total, we have identified SAAs in four genera and six species (Tanarium conoideum Kolosova, 1991, emend. Moczydłowska et al., 1993; Tanarium elegans Liu et al., 2014; Mengeosphaera membranifera Shang, Liu, and Moczydłowska, 2019; Mengeosphaera minima Liu et al., 2014; Estrella recta Liu and Moczydłowska, 2019; Variomargosphaeridium gracile Xiao et al., 2014), as well as two types of MAAs (Tanarium tuberosum Moczydłowska, Vidal, and Rudavskaya, 1993, emend. Moczydłowska, 2015; Weissiella cf. W. grandistella Vorob'eva, Sergeev, and Knoll, 2009, emend. Liu and Moczydłowska, 2019). This updated acritarch assemblage of the Weng'an Biota is valuable for correlating the Ediacaran Doushantuo Formation between the Weng'an and Yangtze Gorges areas. It also serves as a tool to test the proposed acritarch biozones in Ediacaran formations of South China and other localities, including Australia, Siberia, and the East European Platform.

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Journal of Paleontology , Volume 98 , Issue 2 , March 2024 , pp. 308 - 330
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Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of Paleontological Society

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