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Eight species of Chrysolina have been chromosomally studied in male individuals from Central Europe, South France and the Urals, in Russia. Ch. rufa had 2n = 23, Ch. purpurascens crassimargo 2n = 24 and a meioformula of 11 + Xy p , Ch. globosa and Ch. bigorrensis 12 + Xy p , Ch. umbratilis 2n = 30 and 14 + XY p , a new non-chiasmate sex-chromosome system with both male sex-chromosomes...