Horistus orientalis, 2n (♂) = 32 (30A + XY). FISH with 18S rDNA (green) and telomeric (TTAGG)n (pink) probes. Early MI – bivalents with one or occasionally two tenacious threads, the so-called collochores (arrowed). There are no hybridization signals of the (TTAGG)n probe; the signals of the 18S rDNA probe are seen on the XY sex chromosome pseudo-bivalent. Scale bar: 10 μm.