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. 2016 Jul 16;2:13. doi: 10.1186/s40851-016-0049-0

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Late Jurassic Polychelida with preserved compound eyes, continued. a. Specimen of Palaeonpentacheles roettenbacheri (SMNS 67903). b. Close-up on right eye. c. Close-up on facetted region. d. Same details as C, note asterisks (*) revealing each square facet being surrounded by eight neighbored facets. All images are fluorescence composite images