Standard and C-banded meiotic karyotypes of Psylloidea (Sternorrhyncha, Homoptera, Insecta)

Meiotic karyotypes were studied in males of Craspedolepta sonchi (Foerster, 1848), Diaphorina chobauti Puton, 1898, D. lamproptera Burckhardt, 1981, P sylla hartigii Flor, 1861, Cacopsylla palmeni (Loew, 1878), C. hippophaes ( Foerster, 1848), C. melanoneura (Foerster, 1868), C. pyricola (Foerster 184 8), C. moscovita (Andrianova, 1848), Bactericera salicivora (Reuter, 1876), Trioza abdominalis Flor, 1861, T. lauri = Lauritrioza alacris (Flor, 1861) . Karyotypes were 2n = 25 (24 + XO) in all species except B. salicivora wit h 2n = 26 (24 + neo-XY). Testes consisted of two follicles each in all spec ies but P. hartigii with four-follicular testes in males. The discussion co vers the problems of chromosome numbers, sex-determining chromosome systems , B-chromosomes, patterns of C- banding, testis structure, and spermatid de velopment in Psylloidea.