adult head
 |__adult head sensillum_________
head sensillum                   |
 |__adult head sensillum_________|
eye                              |
 |__retina_______________________|
sense organ                      |
 |__photoreceptor________________|
external sensory organ           |
 |__external sensillum___________|
adult peripheral nervous system  |
 |__retina_______________________|
portion of tissue                |
 |__retina_______________________|
sensillum                        |
 |__external sensillum___________|
adult sensillum                  |
 |__adult head sensillum_________|
visual system                    |
 |__photoreceptor________________|
                                 ommatidium  5757 rec.
                                  |__cone cell 494 rec.
                                  |   |__anterior cone cell(+) 2 rec.
                                  |   |__cone cell pigment granule(+)
                                  |   |__equatorial cone cell(+) 4 rec.
                                  |   |__polar cone cell(+) 4 rec.
                                  |   |__posterior cone cell(+) 2 rec.
                                  |__dorsal margin ommatidium 52 rec.
                                  |   |__dorsal margin photoreceptor cell(+) 52 rec.
                                  |__eye photoreceptor cell 2909 rec.
                                  |   |__dorsal margin photoreceptor cell(+) 52 rec.
                                  |   |__eye photoreceptor cell stalk(+) 80 rec.
                                  |   |__inner photoreceptor cell(+) 1242 rec.
                                  |   |__outer photoreceptor cell(+) 605 rec.
                                  |   |__rhabdomere of eye photoreceptor cell(+) 403 rec.
                                  |__lens 164 rec.
                                  |   |__cornea 28 rec.
                                  |   |__pseudocone 13 rec.
                                  |__pale ommatidium 62 rec.
                                  |   |__photoreceptor cell R7 of pale ommatidium 18 rec.
                                  |   |__photoreceptor cell R8 of pale ommatidium 42 rec.
                                  |__primary pigment cell 155 rec.
                                  |   |__primary pigment cell pigment granule 7 rec.
                                  |__yellow ommatidium 61 rec.
                                      |__photoreceptor cell R7 of yellow ommatidium 23 rec.
                                      |__photoreceptor cell R8 of yellow ommatidium 34 rec.