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. 2019 Jan 24;9:598. doi: 10.1038/s41598-018-36959-z

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Schematic model illustrating calcite fibre shape formation for terebratulide and possibly rhynchonellide brachiopods. We see a stack of transversely cut fibres. Prior to fibre secretion OME cell membranes are in close contact with the extracellular organic membrane lining present along the proximal surface of fibres. Detachment of epithelial cells from this membrane lining induces mineral secretion and starts fibre growth (black arrows in schematic 1). When fibres have reached their full width, OME cells start to secrete the organic membrane lining (blue arrows in schematic 2), and when finished, will completely line the basal convex part of the fibre (blue stars in schematic 2).