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Volume 15
Issue 2
10.3390/min15020136
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Palaeostomate Bryozoans from Glacial Erratics in the Tvären Region, Sweden

by
Baopeng Song
1,2,
Yue Liang
1,
Lars E. Holmer
1,2,
Luke C. Strotz
1,3,
Junye Ma
4 and
Zhifei Zhang
1,*
1
State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments, Department of Geology, Northwest University, Xi’an 710069, China
2
Department of Earth Sciences, Palaeobiology, Uppsala University, Uppsala 75236, Sweden
3
Biodiversity Institute and Department of Ecology & Evolutionary Biology, University of Kansas, Lawrence, KS 66045, USA
4
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Palaeoenvironment, Chinese Academy of Sciences (CAS), Nanjing 210008, China
*
Author to whom correspondence should be addressed.
Minerals 2025, 15(2), 136; https://doi.org/10.3390/min15020136
Submission received: 23 December 2024 / Revised: 26 January 2025 / Accepted: 26 January 2025 / Published: 29 January 2025
(This article belongs to the Special Issue Biomineralization and Biominerals: Lessons from Mineral-Producing Organisms, 2nd Edition)
Versions Notes

Abstract

The post-impact fauna of the Dalby Limestone of Tvären Bay has been extensively examined, with the exception of the Palaeostomate bryozoan taxa present. Here, we report three palaeostomate bryozoans found in limestone boulders recovered from glacial deposits on Ringsö Island derived from Tvären Bay, Sweden. The bryozoan fauna includes Pachydictya bifurcata, Hallopora sp., and Trematoporid sp. indet. Pachydictya bifurcata has bifoliate zoaria with two layers of zooecia oriented in opposite directions along the mesotheca. Hallopora sp. is characterized by the presence of mesozooecia, tubular autozooecia with rounded apertures, thin walls, and possessing diaphragms. The zoaria of Trematoporid sp. indet are loosely arranged and slightly ambiguous, but lack further identifying features. The report of Pachydictya bifurcata herein represents an extension of its stratigraphic range within the late Ordovician. These findings enhance our understanding of the bryozoan diversity in the region, providing the first detailed report of the presence of these taxa in this geological context.
Keywords: Bryozoa; colonial animals; lophophorates; Upper Ordovician; Tvären crater Bryozoa; colonial animals; lophophorates; Upper Ordovician; Tvären crater

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MDPI and ACS Style

Song, B.; Liang, Y.; Holmer, L.E.; Strotz, L.C.; Ma, J.; Zhang, Z. Palaeostomate Bryozoans from Glacial Erratics in the Tvären Region, Sweden. Minerals 2025, 15, 136. https://doi.org/10.3390/min15020136

AMA Style

Song B, Liang Y, Holmer LE, Strotz LC, Ma J, Zhang Z. Palaeostomate Bryozoans from Glacial Erratics in the Tvären Region, Sweden. Minerals. 2025; 15(2):136. https://doi.org/10.3390/min15020136

Chicago/Turabian Style

Song, Baopeng, Yue Liang, Lars E. Holmer, Luke C. Strotz, Junye Ma, and Zhifei Zhang. 2025. "Palaeostomate Bryozoans from Glacial Erratics in the Tvären Region, Sweden" Minerals 15, no. 2: 136. https://doi.org/10.3390/min15020136

APA Style

Song, B., Liang, Y., Holmer, L. E., Strotz, L. C., Ma, J., & Zhang, Z. (2025). Palaeostomate Bryozoans from Glacial Erratics in the Tvären Region, Sweden. Minerals, 15(2), 136. https://doi.org/10.3390/min15020136

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