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Raman investigation of the pigment families in recent and fossil brachiopod shells
Danièle Gaspard1, Céline Paris2, Philippe Loubry1
1CR2P, Centre de Recherche sur la Paléodiversité et les Paléoenvironnements, UMR 7207, Muséum National d'Histoire Naturelle, Sorbonne Université, CNRS, 8 Rue Buffon, 75231 Paris Cedex 05, France.
Abstract:
Shells of the three subphyla of extant and extinct representatives of the phylum Brachiopoda display coloured patterns with diverse shapes and at different degrees. These colourations are readily visible in natural light but are best revealed under UV light for the fossils concerned. To identify these pigments, Raman spectroscopy has been used for the first time on brachiopod shells. The widespread identified pigments belong to the carotenoid family, best represented in all the animal kingdom, the second one concerns the melanin/melanin-like pigments and, surprisingly, additional molecules of the cytochrome family are revealed for the first time in one of the brachiopod shells studied. The putative functions of shell pigmentation, still under debate, are discussed.
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