Figure 2-7 from: Grozeva S, Simov N, Langourov M, Dalakchieva S (2013) Sex chromosome pre-reduction in male meiosis of Lethocerus patruelis (Stål, 1854) (Heteroptera, Belostomatidae) with some notes on the distribution of the species. ZooKeys 319: 119-135. https://doi.org/10.3897/zookeys.319.4384

Figure 2-7 - 2 Spermatogonial metaphases: two of larger chromosomes, X and Y, each show a subtelomeric unstained gap, representing the nucleolus organizing region (NOR) (arrow head) (routine staining) 3 Meiotic prophase:sex chromosomes are visible as a large, positively heteropycnotic and brightly fluorescent body (CMA3 staining) 4 Metaphase I (n = 13) (routine staining) 5 Metaphase I: GC-rich NORs located on both X and Y chromosomes (CMA3 staining) 6 After the first meiotic division all the chromosomes segregate to opposite poles (6a) resulting in two daughter MII cells (6b) with 13 elements each, 11A + m + X and 11A + m + Y, respectively (routine staining) 7 Metaphase I: DAPI staining did not reveal any differentiation along the length of the chromosomes. Bar = 10μm.