Ommatidium
Videos
The compound eyes of arthropods like insects, crustaceans and millipedes are composed of units called ommatidia. An ommatidium contains a cluster of photoreceptor cells surrounded by support cells and
Ommatidium: A – cornea, B – crystalline cone, C & D – pigment cells, E – rhabdom, F – photoreceptor cells, G – membrana fenestrata, H – optic nerve
Ommatidia of a krill
Astronotus ocellatus closeup
Pseudopupil
Videos
In the compound eye of arthropods such as insects and crustaceans, the pseudopupil appears as a dark spot which moves across the eye as the animal is rotated. This occurs because the ommatidia that on
Ommatidium
…seven neighboring cells receive R8 signaling to differentiate as photoreceptor neurons, followed by the recruitment of the four non-neuronal cone cells. Pseudopupil Arthropod eye…
The head of a mantis (Prohierodula picta) showing the black pseudopupil in its compound eyes
The eye of a mantis shrimp has three regions, each with its own pseudopupil.