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. 2016 Jan 22;16:19. doi: 10.1186/s12862-016-0582-7

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© Murdock et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 6 — Putative claws of Helenodora inopinata (FMNH PE29050, counterpart). a Optical image produced using Alicona Infinite Focus microscope, with boundaries of putative claws demarked. b anaglyph stereo image to show 3D form of surface. c Back-scattered electron micrograph of region marked on optical image. d Selected element maps generated using EDX analysis and false coloured for comparative purposes. ‘Claws’ are represented by framboidal structures rich in sulphur and iron (pyrite), with some organic carbon. The superficially claw-like morphology is exaggerated by the shape of the broken surface of the fossil, clearly visible in the anaglyph stereo image. sed = sediment. cl = putative claws. Scale bar = 100 μm