Dorsal disks on the abdomens of Aleurodicus dugesii males (Homoptera: Aleurodicinae).
Adult males of Aleurodicus dugesii have large numbers of disks located on the dorsal surface of their abdomens. These disks have many cuticular pores and occur above a relatively large lumen into which 1 or possibly more epidermal cells release secretory material. The complex of modified cuticle and epidermal cells appeared essentially similar to those on the dorsal surface of abdomens of adult males of the aleyrodid Trialeurodes vaporariorum. Thus, the dorsal disks appear to be widely distributed among whiteflies. The function of the dorsal disks and the nature of the secretory material remains unknown. That the disks are sex limited suggests a role in reproduction. For several reasons, but especially because of a lack of innervation, it is thought unlikely that the dorsal disks function as sensory receptors.