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Journal Article

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

Junxian Wu, Weichen Sun, Xiaodong Shang, Pengju Liu, Maoyan Zhu, Zongjun Yin
Published: 01 March 2024
Journal of Paleontology (2024) 98 (2): 308–330.
DOI: https://doi.org/10.1017/jpa.2024.16
.... 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...
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View PDF for article title, New materials of <span class="search-highlight">acanthomorphic</span> acritarchs from the Ediacaran Weng&#x27;an Biota (South China)
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A New Record of Acanthomorphic Acritarch Tappania Yin from the Early Mesoproterozoic Saraipali Formation, Singhora Group, Chhattisgarh Supergroup, India and its Biostratigraphic Significance

Veeru Kant Singh, Mukund Sharma, Vladimir N. Sergeev
Published: 01 November 2019
Jour. Geol. Soc. India (2019) 94 (5): 471–479.
DOI: https://doi.org/10.1007/s12594-019-1343-1
... Tappania Yin is one of the most ancient known morphologically complex acanthomorphic acritarch that has been widely accepted as Proterozoic eukaryotic fossil. It was originally documented from the latest Palaeoproterozoic to early Mesoproterozoic rocks of Beidajian Formation of Ruyang Group of China ( Yin...
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View PDF for article title, A New Record of <span class="search-highlight">Acanthomorphic</span> Acritarch Tappania Yin from the Early Mesoproterozoic Saraipali Formation, Singhora Group, Chhattisgarh Supergroup, India and its Biostratigraphic Significance
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Journal Article

Phosphatized Acanthomorphic Acritarchs and Related Microfossils from the Ediacaran Doushantuo Formation at Weng'an (South China) and their Implications for Biostratigraphic Correlation

Shuhai Xiao, Chuanming Zhou, Pengju Liu, Dan Wang, Xunlai Yuan
Published: 01 January 2014
Journal of Paleontology (2014) 88 (1): 1–67.
DOI: https://doi.org/10.1666/12-157R
... phosphatized acanthomorphic acritarchs, which are useful in the biostratigraphic subdivision and correlation of the lower–middle Ediacaran System. These acritarchs can be studied using both thin sectioning and acid maceration techniques, thus have the potential to resolve taxonomic inconsistencies between...
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View PDF for article title, Phosphatized <span class="search-highlight">Acanthomorphic</span> Acritarchs and Related Microfossils from the Ediacaran Doushantuo Formation at Weng&#x27;an (South China) and their Implications for Biostratigraphic Correlation
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Journal Article

Mazuelloids: Product of Post-Mortem Phosphatization of Acanthomorphic Acritarchs

BARBARA KREMER
Journal: PALAIOS
Published: 01 February 2005
PALAIOS (2005) 20 (1): 27–36.
DOI: https://doi.org/10.2110/palo.2003.p03-112
...BARBARA KREMER Abstract Enigmatic microfossils from the early Silurian of Poland known as mazuelloids (= muellerisphaerids) have been identified as Baltisphaeridium -like acanthomorphic acritarchs that have been subject to post-mortem phosphatization. These acritarchs were the dominant components...
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View PDF for article title, Mazuelloids: Product of Post-Mortem Phosphatization of <span class="search-highlight">Acanthomorphic</span> Acritarchs
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Journal Article

Doushantuo-Pertatataka–type acanthomorphs and Ediacaran ecosystem stability

Dmitriy Grazhdankin, Konstantin Nagovitsin, Elena Golubkova, Galina Karlova, Boris Kochnev, Vladimir Rogov, Vasiliy Marusin
Journal: Geology
Published: 27 April 2020
Geology (2020) 48 (7): 708–712.
DOI: https://doi.org/10.1130/G47467.1
... in the Ediacaran (635–542 Ma). These microfossils, collectively known as the Doushantuo-Pertatataka–type acanthomorphs, have been variously interpreted as a polyphyletic assortment of resting stages of eukaryotes, including animals. The stratigraphic range of the acanthomorphs has long been thought...
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View PDF for article title, Doushantuo-Pertatataka–type <span class="search-highlight">acanthomorphs</span> and Ediacaran ecosystem stability
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Paleoenvironmental distribution of reported acanthomorphic acritarchs from ...

Published: 01 November 2024
Table 3. Paleoenvironmental distribution of reported acanthomorphic acritarchs from the Doushantuo Formation in South China. Numbers in each cell refer to data sources, as detailed below. Hashtag sign (#) indicates that the reported specimen was mistakenly assigned to Briareus vasformis Liu
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The distribution of the Ediacaran small and medium-sized acanthomorphic acritarchs in the present study (modified from Li et al., 2008).

The distribution of the Ediacaran small and medium-sized acanthomorphic acr...

Published: 01 March 2024
Figure 12. The distribution of the Ediacaran small and medium-sized acanthomorphic acritarchs in the present study (modified from Li et al., 2008 ).
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Summary of previous reports of acanthomorphic acritarchs from the Infra-Kro...

Published: 01 March 2024
Table 1. Summary of previous reports of acanthomorphic acritarchs from the Infra-Krol and Krol A formations in Lesser Himalaya.
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Pie diagram showing relative abundance of acanthomorphic and herkomorphic taxa from the Krol A Formation. The four acanthomorph groups, as discussed in the text, are color coded (blue, thin and short processes; brown, thin and long processes; green, large and thick processes; red, obtuse processes) to show that the assemblage is dominated by acanthomorphs with thin processes. Schematic diagrams denoting the vesicle size and ornament morphology are shown. Note that scales are different for vesicles and ornaments (processes in acanthomorphs and reticula in herkomorphs).

Pie diagram showing relative abundance of acanthomorphic and herkomorphic t...

Published: 01 March 2024
Figure 29. Pie diagram showing relative abundance of acanthomorphic and herkomorphic taxa from the Krol A Formation. The four acanthomorph groups, as discussed in the text, are color coded (blue, thin and short processes; brown, thin and long processes; green, large and thick processes; red
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Medium-sized (20–60 µm) acanthomorphic acritarchs. 1–19, acritarchs from the genus Skiagia. 1, S. scottica Downie 1982. 2–3, S. ciliosa (Volkova 1969) Downie 1982, morphotypes A (2) and morphotype B (3). 4, S. orbiculare (Volkova 1968) Downie 1982. 5, S. ornata (Volkova 1968) Downie 1982. 6, S. compressa (Volkova 1968) Downie 1982. 7–8, S. pura Moczydłowska 1988, emend. 9, S. cf. compressa. 10–15, 18–19, vesicles interpreted as taphonomic variants of Skiagia, including forms resembling Baltisphaeridium (10–12), Globosphaeridium cerinum (13–14) or Lophosphaeridium dubium (14–15, 18–19). 16–17, S. ciliosa (morphotype C). 20, Parmasphaeridium implicatum (Fridrichsone 1971) Jachowicz-Zdanowska, 2013. Black arrowheads point to funnel-shaped process termination; white arrowheads point to plug-like or septum-like structures. 1, MGUH 33960; 2, MGUH 184004-B2-0580; 3, MGUH 33962; 4, MGUH 33963; 5, PMU 184004(1)-36189; 6, MGUH 33964; 7, MGUH 184004-B-0609; 8, MGUH 184003-2-0297; 9, MGUH 33966; 10, PMU 184004(2)-54; 11, MGUH 184004-A2-0769; 12, MGUH 184003-1-1188; 13, MGUH 184003-2-0663; 14, MGUH 184002-1-0185; 15, MGUH 184002-2-1969; 16, MGUH 34002; 17, MGUH 184002-1-0681; 18, MGUH 184004-B1-0591; 19, MGUH 184004-B1-0017; 20, MGUH 184003-2-0211. Scale bar equals 10 µm except enlargements in 1a–20a (5 µm).

Medium-sized (20–60 µm) acanthomorphic acritarchs. 1–19, acritarchs from th...

Published: 06 October 2023
Plate 6. Medium-sized (20–60 µm) acanthomorphic acritarchs. 1–19, acritarchs from the genus Skiagia . 1, S. scottica Downie 1982 . 2–3, S. ciliosa (Volkova 1969 ) Downie 1982 , morphotypes A (2) and morphotype B (3). 4, S. orbiculare (Volkova 1968 ) Downie 1982 . 5, S. ornata
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Thin-section photomicrographs of Cambrian acanthomorphic acritarchs from the Yanjiahe Formation. (a–c) Asteridium tornatum; (d) A. tornatum (upper and lower right) and H. ampliatum (lower right); (e–g) Heliosphaeridium ampliatum; (h) A. tornatum (left) and H. ampliatum (right); (i) Heliosphaeridium dissimilare; (j–l) Comasphaeridium annulare. Scale bars represent 10µ for a-l. (a) YB 0.6_1a_4_2; (b) SY2 2.0_4a_4_4; (3) SY2 2.0_4a_4_4; (d) SY2 2.0_1f_2_6; (e) YB 0.6_2a_1; (f) YB 0.4_2a_3_1; (g) YB 0.6_2a_1; (h) SY2 1.4_1d_11_3; (i) SY2_-0.3_2f_1_1; (j) YB -3.7_2a_9; (k) SY2 0.7_4b_1_4; (l) SY2 -3.1_1e_1_2.

Thin-section photomicrographs of Cambrian acanthomorphic acritarchs from th...

Published: 13 February 2017
Figure 2. Thin-section photomicrographs of Cambrian acanthomorphic acritarchs from the Yanjiahe Formation. (a–c) Asteridium tornatum ; (d) A. tornatum (upper and lower right) and H. ampliatum (lower right); (e–g) Heliosphaeridium ampliatum ; (h) A. tornatum (left) and H. ampliatum
Journal Article

Earliest North American articulated freshwater acanthomorph fish (Teleostei: Percopsiformes) from Upper Cretaceous deposits of Alberta, Canada

Alison M. Murray, Donald B. Brinkman, Michael G. Newbrey, Andrew G. Neuman
Published: 02 December 2019
Geological Magazine (2020) 157 (7): 1087–1096.
DOI: https://doi.org/10.1017/S0016756819001328
...Alison M. Murray; Donald B. Brinkman; Michael G. Newbrey; Andrew G. Neuman Abstract Fossil material from the Maastrichtian part of the Scollard Formation is identified as belonging to an acanthomorph fish. An articulated specimen, preserved in part and counterpart, is a member...
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View PDF for article title, Earliest North American articulated freshwater <span class="search-highlight">acanthomorph</span> fish (Teleostei: Percopsiformes) from Upper Cretaceous deposits of Alberta, Canada
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Summary of occurrence and abundance data for acanthomorphs, herkomorphs, an...

Published: 01 March 2024
Table 3. Summary of occurrence and abundance data for acanthomorphs, herkomorphs, and selected sphaeromorphs from the Krol A Formation. Number of specimens from each fossiliferous horizon is reported, with empty cells representing absence. A* = acanthomorphs; H* = herkomorphs; S* = sphaeromorphs
Journal Article

Silicified microfossils from the Ediacaran Doushantuo Formation along a shelf margin-slope-basin transect in Hunan Province, South China, with stratigraphical implications

Qing Ouyang, Chuanming Zhou, Shuhai Xiao, Chengxi Wu, Zhe Chen, Xianguo Lang, Hongyi Shi, Yunpeng Sun
Published: 01 November 2024
Journal of Paleontology (2024) 98 (S95): 1–79.
DOI: https://doi.org/10.1017/jpa.2023.92
...Table 3. Paleoenvironmental distribution of reported acanthomorphic acritarchs from the Doushantuo Formation in South China. Numbers in each cell refer to data sources, as detailed below. Hashtag sign (#) indicates that the reported specimen was mistakenly assigned to Briareus vasformis Liu...
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View PDF for article title, Silicified microfossils from the Ediacaran Doushantuo Formation along a shelf margin-slope-basin transect in Hunan Province, South China, with stratigraphical implications
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Representative localities from Ediacaran basins where acanthomorphs have been reported. Also included are terminal Ediacaran to early Cambrian assemblages from the Lena-Anabar Basin (Grazhdankin et al., 2020) and the Khuvsgul Basin (Anderson et al., 2017, 2019). Ediacaran acanthomorphs were reported from the Zavkhan material (Ragozina et al., 2016), but the published illustrations are not convincing. (1) Localities on a modern geographic map. The scarcity of Ediacaran acanthomorphs in the western hemisphere is likely due to poor sampling intensity. (2) Localities on a ca. 600 Ma paleogeographic map (Merdith et al., 2021). The paleogeographic location of Svalbard is uncertain, but it probably was close to Greenland (Gasser, 2013). Note that Ediacaran acanthomorphs are concentrated in low latitudes and the possibility of two paleobiogeographic provinces (Gondwana vs. Laurentia-Baltica-Siberia). Also note the paleogeographic proximity between Lesser Himalaya and South China (particularly Liujing and Weng'an). Maps were generated using the software gplate.

Representative localities from Ediacaran basins where acanthomorphs have be...

Published: 01 March 2024
Figure 35. Representative localities from Ediacaran basins where acanthomorphs have been reported. Also included are terminal Ediacaran to early Cambrian assemblages from the Lena-Anabar Basin (Grazhdankin et al., 2020 ) and the Khuvsgul Basin (Anderson et al., 2017 , 2019 ). Ediacaran
Journal Article

Systematic paleontology, acritarch biostratigraphy, and δ 13 C chemostratigraphy of the early Ediacaran Krol A Formation, Lesser Himalaya, northern India

Shuhai Xiao, Ganqing Jiang, Qin Ye, Qing Ouyang, Dhiraj M. Banerjee, Birendra P. Singh, A. D. Muscente, Chuanming Zhou, Nigel C. Hughes
Published: 01 March 2024
Journal of Paleontology (2024) 98 (2): 159–220.
DOI: https://doi.org/10.1017/jpa.2022.7
...Table 1. Summary of previous reports of acanthomorphic acritarchs from the Infra-Krol and Krol A formations in Lesser Himalaya. ...
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Summary of acanthomorph occurrence and abundance data at the nine studied s...

Published: 01 November 2024
Table 2. Summary of acanthomorph occurrence and abundance data at the nine studied sections. Each occurrence is denoted by fossiliferous sample name and number of specimens. For example, “21DC-4, 1” means one acanthomorph specimen recovered from the sample 21DC-4. Notes for superscripts: (1
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Rarefaction analysis of Doushantuo acanthomorphs. (1) Rarefaction curves with 1σ error bars of Doushantuo acanthomorph assemblages published with abundance data from 10 sections in inner shelf, shelf-lagoon, and slope facies. (2) Magnification of gray box in bottom-left of (1), showing rarefied species richness with subsampled size of 1–40 specimens. Sample sizes of Lianghekou section and basinal facies sections are small, therefore they were not rarefied. Rather, observed specimen number and species richness are plotted for Lianghekou section and pooled basinal facies data.

Rarefaction analysis of Doushantuo acanthomorphs. ( 1 ) Rarefaction curves ...

Published: 01 November 2024
Figure 40. Rarefaction analysis of Doushantuo acanthomorphs. ( 1 ) Rarefaction curves with 1σ error bars of Doushantuo acanthomorph assemblages published with abundance data from 10 sections in inner shelf, shelf-lagoon, and slope facies. ( 2 ) Magnification of gray box in bottom-left of ( 1
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Comparison of acanthomorph diversity among different depositional facies at species and genus levels.

Comparison of acanthomorph diversity among different depositional facies at...

Published: 01 November 2024
Figure 39. Comparison of acanthomorph diversity among different depositional facies at species and genus levels.
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Summary of measurements of acanthomorphs, herkomorphs, and selected sphaero...

Published: 01 March 2024
Table 4. Summary of measurements of acanthomorphs, herkomorphs, and selected sphaeromorphs from the Krol A Formation.