The tiered retina of Dytiscus: a new type of compound eye.
D000818:Animals; D001517:Coleoptera / Q000033:anatomy & histology*; D004596:Electroretinography; D005071:Evoked Potentials; D008027:Light; D011830:Radiation Effects; D012160:Retina / Q000033:anatomy & histology* / Q000502:physiology; D011984:Sensory Receptor Cells / Q000528:radiation effects