FISH mapping of TTAGG telomeric sequences (red signals) and 18S rDNA (green signals) to meiotic chromosomes of Psocoptera a Valenzuela burmeisteri, MI, n = 8 + X b Stenopsocus lachlani, MI, n = 11 + X c Graphopsocus cruciatus, MI, n = 8 + X d Peripsocus phaeopterus, MI, n = 8 + X e Philotarsus picicornis, MI, n = 8 + X f Amphigerontia bifasciata, diakinesis, n = 8 + X g Psococerastis gibbosa, MI, n = 8 + X h Metylophorus nebulosus, MI, n = 7 + X. Arrowheads and arrows indicate sex chromosomes and 18S rDNA signals, respectively. Scale bar: 10 μm.