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Microlens arrays in the complex visual system of Cretaceous echinoderms

Author

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  • Przemysław Gorzelak

    (Institute of Paleobiology, Polish Academy of Sciences)

  • Mariusz A. Salamon

    (Faculty of Earth Sciences, University of Silesia)

  • Rafał Lach

    (Faculty of Earth Sciences, University of Silesia)

  • Michał Loba

    (Faculty of Geology, University of Warsaw)

  • Bruno Ferré

    (Dame du Lac 213, 3 rue Henri Barbusse)

Abstract

It has long been assumed that photosensitivity in echinoderms is mainly related to diffuse photoreception mediated by photosensitive regions embedded within the dermis. Recent studies, however, have shown that some extant echinoderms may also display modified ossicles with microlenses acting as sophisticated photosensory organs. Thanks to their remarkable properties, these calcitic microlenses serve as an inspiration for scientists across various disciplines among which bio-inspired engineering. However, the evolutionary origins of these microlenses remain obscure. Here we provide microstructural evidence showing that analogous spherical calcitic lenses had been acquired in some brittle stars and starfish of Poland by the Late Cretaceous (Campanian, ~79 Ma). Specimens from Poland described here had a highly developed visual system similar to that of modern forms. We suggest that such an optimization of echinoderm skeletons for both mechanical and optical purposes reflects escalation-related adaptation to increased predation pressure during the so-called Mesozoic Marine Revolution.

Suggested Citation

  • Przemysław Gorzelak & Mariusz A. Salamon & Rafał Lach & Michał Loba & Bruno Ferré, 2014. "Microlens arrays in the complex visual system of Cretaceous echinoderms," Nature Communications, Nature, vol. 5(1), pages 1-6, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4576
    DOI: 10.1038/ncomms4576
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