#eversible vesicles

Chaetochlorops inquilinus (Chloropidae)

"Similar eversible abdominal structures in some Oscinellinae genera such as Polyodaspis, Lasiambia, and Chaetochlorops most likely evolved independently. In none of these taxa has the function of the eversible vesicles been studied, but it has been suggested that they are involved in the production and dispersal of pheromones" - KOTRBA, M. (2009): Male flies with yellow balls – New observations on the eversible vesicles on the postabdomen of male Thaumatomyia notata (Diptera: Chloropidae)