Journal
JOURNAL OF COMPARATIVE PHYSIOLOGY A-NEUROETHOLOGY SENSORY NEURAL AND BEHAVIORAL PHYSIOLOGY
Volume 202, Issue 3, Pages 203-213Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00359-015-1065-9
Keywords
Compound eye; Photoreceptors; Spectral sensitivity; Color vision
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Funding
- European Community [FP7 KBBE 2011-5-289566]
- Slovenian Research Agency [P3-0333]
- Proteus bilateral programme Ryncho senses
- Grants-in-Aid for Scientific Research [14F04764] Funding Source: KAKEN
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The red palm weevil (RPW) is a severe palm pest with high dispersal capability. Its visual sense allows it to navigate long distances and to discriminate among differently colored traps. We investigated the RPW compound eyes with anatomical and electrophysiological methods. The ommatidia are composed of eight photoreceptor cells in an open rhabdom arrangement with six peripheral and two central photoreceptors. The photoreceptor signals are relatively slow and noisy. The majority of recorded photoreceptors have broad spectral sensitivity with a peak in the green, at 536 nm. Three minor classes of photoreceptors have narrower spectral sensitivities with maxima in the UV (366 nm), green (520 nm) and yellow (564 nm). Sensitivity below 350 nm is very low due to filtering by the UV-absorbing cornea. The set of photoreceptors represents the retinal substrate for putative trichromatic color vision.
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