EN
Karyotypes (number and size of chromosomes, sex -determining system) and testis structure (number of testicular follicles) of 37 species belonging to 24 genera of the little studied fulgoroid families Cixiidae, Meenoplidae, Derbidae, Achilidae, Nogodinidae, Tropiduchidae and Flatidae are presented. For Meenoplidae, Nogodinidae and Tropiduchidae data on the testis structure have been obtained for the first time. The data available for Fulgoroidea as a whole are reviewed.