Abstract
SixChrysolina species from Catalonia and the Canary Islands (Spain), viz.americana, gemina, femoralis, cerealis, menthastri andpolita, have similar diploid karyotypes of 24 (sub)metacentric chromosomes, and show Xy sex-determining system.C. banksi andobsoleta have 2n (♂)=23; their karyotype is presumably derived from that of the former group by loss of the y chromosomes. InC. haemoptera andC. carnifex 40 elements appear in the diploid set. It seems that 2n=24 is the most frequent number in theChrysolina. Higher chromosome numbers have possibly originated through centric fissions, as the acrocentric shape ofC. carnifex chromosomes seems to suggest. The 2n=23 and 24 species feed onLabiatae, while the two higher chromosome number species are associated with plants belonging to other families.
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Petitpierre, E. Notes on chromosomes of ten species of the genus chrysolina mots. (Coleoptera:Chrysomelidae). Genetica 45, 349–354 (1975). https://doi.org/10.1007/BF01508309
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DOI: https://doi.org/10.1007/BF01508309