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We report several chromosomal traits in 11 species from 8 genera of the planthopper family   Issidae  , the tribes   Issini  ,   Parahiraciini   and   Hemisphaeriini  . All species present a 2n = 27, X(0) chromosome complement known to be ancestral for the family. The karyotype is conserved in structure and consists of a pair of very large autosomes; the remaining chromosomes gradually decrease in size and the X chromosome is one of the smallest in the complement. For selected species, analyses based on C-, AgNOR- and CMA 3 -banding techniques were also carried out. By fluorescence  in situ  hybridization, the (TTAGG)  n   probe identified telomeres in all species, and the major rDNA loci were detected on the largest pair of autosomes. In most species, ribosomal loci were found in an interstitial position while in two species they were located in telomeric regions suggesting that chromosomal rearrangements involving the rDNA segments occurred in the evolution of the family   Issidae  . Furthermore, for 8 species the number of testicular follicles is provided for the first time.

comparative cytogenetics

Karyotype stability in the family   Issidae   (  Hemiptera  ,   Auchenorrhyncha  ) revealed by chromosome techniques and FISH with telomeric (TTAGG) n  and 18S rDNA probes