Eye Color Changes Due to Pigment Migration in Some Species of Heteroptera and Homoptera
Abstract
Changes in eye color in response to light and darkness were observed in Trigonotylus doddi (Distant) (Heteroptera: Miridae), Saccharosydne saccharivora Westwood, Perkinsiella saccharicida Kirkaldy (Homoptera: Delphacidae), and Cyarda melichari Van Duzee (Homoptera: Flatidae). Histological examinations of the eyes of P. saccharicida revealed that pigments were condensed in a zone proximal to the crystalline cones when light-adapted, and dispersed distally into the region of the cones when dark-adapted. This adaptation is believed to occur primarily in nocturnal insects or species that are active by day and night. Eye color changes were not observed in 23 additional species of Heteroptera and Homoptera collected in Southern Florida, including Unerus colonus (Uhler) (Homoptera: Cicadellidae), which is reported for the first time from the United States.Downloads
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