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[Dataset] Two chiral types of randomly rotated ommatidia are distributed across the retina of the flathead oak borer Coraebus undatus (Coleoptera: Buprestidae)

Other Titles[Dataset] Coraebus undatus retina
AuthorsBelusic, Gregor; Meglic, Andrej; Ilic, Marko; Quero, Carmen ; Arikawa, Kentaro
KeywordsCompound eye
Flathead oak borer
Retinal mosaic
Spectral sensitivity
Issue Date2020
AbstractWe investigated the retina and coloration of one member of this family, the flathead oak borer Coraebus undatus using microscopy, spectrometry, polarimetry, electroretinography and intracellular recordings of photoreceptor cell responses. The compound eyes are built of a highly unusual mosaic of mirror-symmetric or chiral ommatidia that are randomly rotated along the body axes. Each ommatidium has eight photoreceptors, two of them having rhabdomeres in tiers. The eyes contain six spectral classes of photoreceptors, peaking in the UV, blue, green and red. Most photoreceptors have moderate polarization sensitivity with randomly distributed angular maxima. The beetles have the necessary retinal substrate for complex color vision, required to recognize conspecifics and suitable for a targeted design of color traps. However, the jewel beetle array of freely rotated ommatidia is very different from the ordered mosaic in insects that have object-directed polarization vision. We propose that ommatidial rotation enables the cancelling out of polarization signals, thus allowing stable color vision, similar to the rhabdomeric twist in the eyes of flies and honeybees.
DescriptionLight microscopical sections of the proximal retina of female (D, E) and male (F, G) Coraebus undatus. If the crystalline cone extensions are visible as varicosities between adjacent photoreceptor cells, then it is possible to infer the ommatidial chirality and map the chiral ommatidia accross the section.
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