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