13 Photoreceptors flashcards |

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location

usually anterior

compound eyes

consists of many individual receptors

individual receptors

ommatidia

number of receptors

1-3000

more receptors

more resolution and depth perception for predators and fliers

types of receptors

apposition and superposition

apposition

common in day fliers
corneal lens and crystalline cone gather light onto rhabdom
light focused onto each rhabdom by its own lens

superposition

can retract pigment to switch between daytime or night time
light of many lenses focused on single rhabdom in dim light

Ocelli number

Maximum 3 per individual

ocelli function

integrate light over large visual field but with low resolution
perception of photoperiod which affects circadian rhythm

stemmata

larvae photoreceptors
location on gena

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