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Fig. 6 | BMC Evolutionary Biology

Fig. 6

From: The impact of taphonomic data on phylogenetic resolution: Helenodora inopinata (Carboniferous, Mazon Creek Lagerstätte) and the onychophoran stem lineage

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

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