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. 2020 Sep;18(5):560-565.
doi: 10.1111/gbi.12397. Epub 2020 Apr 28.

Chemical signatures of soft tissues distinguish between vertebrates and invertebrates from the Carboniferous Mazon Creek Lagerstätte of Illinois

Victoria E McCoy  1   2 , Jasmina Wiemann  3 , James C Lamsdell  4 , Christopher D Whalen  3 , Scott Lidgard  5 , Paul Mayer  5 , Holger Petermann  6 , Derek E G Briggs  3   7
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Chemical signatures of soft tissues distinguish between vertebrates and invertebrates from the Carboniferous Mazon Creek Lagerstätte of Illinois

Victoria E McCoy et al. Geobiology. 2020 Sep.

Abstract

The chemical composition of fossil soft tissues is a potentially powerful and yet underutilized tool for elucidating the affinity of problematic fossil organisms. In some cases, it has proven difficult to assign a problematic fossil even to the invertebrates or vertebrates (more generally chordates) based on often incompletely preserved morphology alone, and chemical composition may help to resolve such questions. Here, we use in situ Raman microspectroscopy to investigate the chemistry of a diverse array of invertebrate and vertebrate fossils from the Pennsylvanian Mazon Creek Lagerstätte of Illinois, and we generate a ChemoSpace through principal component analysis (PCA) of the in situ Raman spectra. Invertebrate soft tissues characterized by chitin (polysaccharide) fossilization products and vertebrate soft tissues characterized by protein fossilization products plot in completely separate, non-overlapping regions of the ChemoSpace, demonstrating the utility of certain soft tissue molecular signatures as biomarkers for the original soft tissue composition of fossil organisms. The controversial problematicum Tullimonstrum, known as the Tully Monster, groups with the vertebrates, providing strong evidence of a vertebrate rather than invertebrate affinity.

Keywords: Tully Monster; chitin; chordate; in situ Raman spectroscopy; keratin; protein fossilization products.

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References

REFERENCES

    1. Alleon, J., Bernard, S., Le Guillou, C., Daval, D., Skouri-Panet, F., Kuga, M., & Robert, F. (2017). Organic molecular heterogeneities can withstand diagenesis. Scientific Reports, 7, 1508. https://doi.org/10.1038/s41598-017-01612-8
    1. Beall, B. S. (1991). The Tully Monster and a new approach to analyzing problematica. In A. M. Simonetta, & S. Conway Morris (Eds.), The early evolution of Metazoa and the significance of problematic taxa (pp. 271-285). Cambridge, UK: Cambridge University Press.
    1. Briggs, D. E. G., & Summons, R. E. (2014). Ancient biomolecules: Their origins, fossilization, and role in revealing the history of life. BioEssays, 36, 482-490. https://doi.org/10.1002/bies.201400010
    1. Clements, T., Dolocan, A., Martin, P., Purnell, M. A., Vinther, J., & Gabbott, S. E. (2016). The eyes of Tullimonstrum reveal a vertebrate affinity. Nature, 532, 500-503. https://doi.org/10.1038/nature17647
    1. Clements, T., Purnell, M. A., & Gabbott, S. E. (2019). The Mazon Creek Lagerstätte: A diverse late Palaeozoic ecosystem entombed within siderite concretions. Journal of the Geological Society, 176, 1-11.

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