Karyotype stability in the family Issidae (Hemiptera, Auchenorrhyncha) revealed by chromosome techniques and FISH with telomeric (TTAGG)nand 18S rDNA probes.
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 CMA3-banding techniques were also carried out. By fluorescencein situhybridization, the (TTAGG)nprobe 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.
Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, Sławkowska 17, 30-016 Kraków, Poland.
Anna
A
Maryańska-Nadachowska
Zoological Institute, Russian Academy of Sciences, Universitetskaya nab. 1, 199034 St. Petersburg, Russia.
Boris A
BA
Anokhin
Zoological Institute, Russian Academy of Sciences, Universitetskaya nab. 1, 199034 St. Petersburg, Russia.
Vladimir M
VM
Gnezdilov
Zoological Institute, Russian Academy of Sciences, Universitetskaya nab. 1, 199034 St. Petersburg, Russia.
Valentina G
VG
Kuznetsova
(TTAGG)n; 18S rDNA; C-banding; FISH; Fulgoroidea; Issidae; NORs; fluorochrome staining; karyotypes