1–6 Male meiosis in Tingis crispata (conventional staining): 1 diffuse stage 2 early diakinesis, two-chiasmate bivalent is indicated by arrow 3 early MI 4 mature MI 5 early AI 6 MII. Sex chromosomes are indicated by arrowheads 7–10 Meiotic chromosomes in Tingidae species after FISH with an 18S rDNA probe: 7 diakinesis in T. crispata 8 first prometaphase in T. cardui 9 MI in Elasmotropis testacea 10 first prometaphase in A. femorale. Sex chromosomes are indicated by arrowheads; autosomally located signals are indicated by arrows.