Meiotic chromosomes of Chthonius (Chthonius) raridentatus, cytotype I (A–F) and Chthonius (Ephippiochthonius) tetrachelatus (G, H). A zygotene B pachytene C, D postpachytene E metaphase I F metaphase II G, H postpachytene. Standard chromosomes stained with Giemsa (A–C, E–G) and the chromosomes after C-banding stained with DAPI (inverted) (D, H). Arrowheads indicate X sex chromosomes, arrows indicate metacentric autosomes. Scale bar = 10 µm.