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Fig. 2 | Frontiers in Zoology

Fig. 2

From: Eumelanin and pheomelanin pigmentation in mollusc shells may be less common than expected: insights from mass spectrometry

Fig. 2

Extracted ion chromatograms (negative-ion mode) for eumelanin (black) and pheomelanin (red) specific oxidation products. Evidence for melanin in shell pigmentation was found in one bivalve (Mytilus edulis), one cephalopod (Nautilus pompilius) and three gastropods (Cepaea nemoralis, Clanculus pharaonius, Steromphala adriatica). All other species investigated showed no detectable signal for melanin oxidation products (chromatograms not pictured here). Note that sample extract of Steromphala adriatica shows degradation of PTCA to PDCA following sample storage (− 20 °C for 32 weeks)

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