01218nas a2200145   4500008004100000022001300041245005700054210005400111300001400165490000800179520074500187653001300932100003100945856009600976       2004                        eng d  a1424858100aB chromosomes in Sternorrhyncha (Hemiptera, Insecta)0 aB chromosomes in Sternorrhyncha Hemiptera Insecta  a210–2140 v1063 aIn the hemipteroid insects of the suborder Sternorrhyncha, B chromosomes are relatively common in comparison with other suborders of Hemiptera. However, the occurrence of supernumerary chromosomes is restricted, in most cases, to several genera or closely related species. At least in some species of Psylloidea with the XY sex determination system, a mitotically stable B chromosome integrated into an achiasmatic segregation system with the X, and became fixed as a Y chromosome. In some Aphidoidea with a multiple X system of sex determination, B chromosomes appear to be in fact non-functional X chromosomes. Supernumerary chromosomes thus probably play an important role in the evolution of sex determination systems in Sternorrhyncha.10aBulgaria1 aMaryañska-Nadachowska, A.  uhttps://psylloidea-bg.myspecies.info/content/b-chromosomes-sternorrhyncha-hemiptera-insecta