Abstract
SummaryMitotic and meiotic C-banded chromosomes of four species of Monochamus Dejean 1821, including two Palaearctic, M. sartor (Fabricius 1787) (2n = 24) and M. sutor (L. 1758) (2n = 20) and two Nearctic species, M. scutellatus (Say 1824) and M. notatus (Drury 1773) (2n = 21 for both) were studied and compared. Considering published data on other species and personal unpublished data, a chromosomal phylogeny is proposed. The karyotypes of M. sutor and M. saltuarius (Gebler 1830) remained close to that of the ancestor. From this starting point, the karyotype of other Palaearctic species evolved by fissions, increasing chromosome number up to 24, as in M. urussovi (Fischer 1806)/M. sartor. The karyotype of Nearctic species underwent the pericentric inversion of at least two (M. scutellatus) to four (M. notatus) chromosomes and acquired one or two dispensable B chromosomes, previously interpreted as multiple sex chromosomes.
Published Version
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