The ommatidium of the dorsal eye of cloeon as a specialization for photoreisomerization.
D000818:Animals; D003315:Cornea / Q000033:anatomy & histology; D004175:Diptera / Q000033:anatomy & histology*; D005123:Eye / Q000033:anatomy & histology* / Q000166:cytology; D008297:Male; D010786:Photoreceptor Cells / Q000033:anatomy & histology; D010857:Pigment Epithelium of Eye / Q000166:cytology; D014785:Vision, Ocular