Achiasmatic male meiosis of collochore type in the heteropteran family Miridae

Male meiosis was studied in Capsus ater (L.), Calocoris quadripunctatus (Vil.). Pilophorus cinnamopterus (Kbm.) and Plagiognathus arbustorum (F.). The chromosomes condense out from diffuse stage as single units during meiotic prophase. sister chromatids being not separable. Opening-out of bivalents occurs. and homologous chromosomes are connected generally only at one site by tenacious threads comparable to collochores found in Drosophila male meiosis, i.e.. meiosis is achiasmatic. At late prophase. bivalents consist of twochromosomes aligned in parallel. At metaphase 1, bivalents orientate equatorially. and chromosomes move sideways towards the poles at anaphase I. i.e., they are unable to show telokinetic activity. If mchromosomes are present, they always form a bivalent, show negative heteropycnosis from late prophase onwards and are situated on the periphery of a radial metaphase plate at metaphase 11.

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