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Facies

, Volume 60, Issue 2, pp 651–662 | Cite as

The Paleozoic problematica Wetheredella and Allonema are two aspects of the same organism

  • Emilia JarochowskaEmail author
  • Axel Munnecke
Original Article

Abstract

Wetheredella is a calcareous encrusting microproblematicum known only from its two-dimensional expression in thin-sections. It occurs in Cambrian through Permian rocks, often in association with Rothpletzella and Girvanella, probable calcifying cyanobacteria. We show that Wetheredella can be produced by sectioning of the Paleozoic incertae sedis sclerobiont Allonema, which has until now been recognized based on its surface, 3D aspect. Therefore, we propose that Wetheredella should be regarded as a junior synonym of Allonema. Structures resembling Wetheredella have also been obtained in thin-sections through another encrusting microproblematicum, Ascodictyon, which, however, differs in the ultrastructure of its wall, which consists of parallel calcite crystals in contrast to radial crystals in Allonema. Allonema specimens used in the study were extracted from the Middle Silurian Mulde Brick-clay Member (Gotland, Sweden), representing an off-platform environment below the photic zone. This, together with the primary calcitic, radial wall structure of Allonema argues against a cyanobacterial or algal affinity, which had been considered for Wetheredella. The taxonomic position of Allonema remains unresolved, but the sclerobiont shares many common characteristics with some Paleozoic encrusting foraminifers. Combining the occurrence data on Allonema in its surface aspect and the “Wetheredella” aspect recognized in thin-sections may shed more light on its affinity and paleoecological functions, particularly its association with cyanobacteria and its role as a framework-builder in Paleozoic reefs.

Keywords

Pseudo-bryozoans Ascodictyon Rothpletzella Cyanobacteria Tuberitinidae Ptychocladiidae 

Notes

Acknowledgments

This work was supported by the Deutsche Forschungsgemeinschaft (Project No. Mu 2352/3). We wish to thank A. Ernst, P. D. Taylor, and M.A. Wilson for help in the identification of Allonema and in accessing the literature. We are grateful to O. Vinn and R. Riding for suggestions that helped to improve the present version of the manuscript, as well as two anonymous reviewers and the PALAIOS Editors who provided constructive comments on an earlier version and helped to improve the language. We also thank I. Oswald for kindly sharing the thin-sections and observations on Wetheredella from the Tofta Fm. in Nors, Gotland; K. Frisch, B. Leipner-Mata, and Ch. Schulbert for help in sample preparation and SEM photography, and C. Färber for collecting the material in Gotland. This paper is a contribution to the International Geoscience Programme (IGCP) Project 591—The Early to Middle Palaeozoic Revolution.

Supplementary material

10347_2014_399_MOESM1_ESM.xls (31 kb)
Supplementary material 1 (XLS 31 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.GeoZentrum Nordbayern, Fachgruppe PaläoumweltUniversität Erlangen-NürnbergErlangenGermany

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