File Large brown mantid close up nohair.jpg thumb right Close up image of a mantis face Archimantis latistyla showing the black pseudopupil in its compound eye. In the compound eye of invertebrate s such as insect s and crustacean s, the pseudopupil appears as a dark spot which moves across the eye as the animal is rotated. ref name Land cite journal author M. F. Land, G. Gibson, J. Horwood & J. Zeil year 1999 title Fundamental differences in the optical structure of the eyes of nocturnal and diurnal mosquitoes journal Journal of Comparative Physiology A volume 185 issue 1 pages 91 103 doi 10.1007 s003590050369 url http web.neurobio.arizona.edu gronenberg nrsc581 eyedesign differencesnightdaymosquitoes.pdf format Portable Document Format PDF ref This occurs because the ommatidia which one observes head on along their optical axis optical axes absorb the incident light , while those to one side reflect it. ref name Zeil cite journal author Jochen Zeil & Maha M. Al Mutairi year 1996 title Variations in the optical properties of the compound eyes of Uca lactea annulipes journal The Journal of Experimental Biology volume 199 issue 7 pages 1569 1577 url http jeb.biologists.org cgi reprint 199 7 1569.pdf format Portable Document Format PDF pmid 9319471 ref The pseudopupil therefore reveals which ommatidia are aligned with the axis along which the observer is viewing. ref name Zeil References reflist 2 Category Eye eye stub ... more details
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