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We provide the first karyotype description of the agro-predatory ant species    Megalomyrmex   incisus    Smith, 1947 (  Myrmicinae  ,   Formicidae  ), and chromosome counts of its host    Mycetophylax   conformis    (Mayr, 1884) (  Myrmicinae  ,   Formicidae  ) from geographically distinct populations. Colonies of both species were sampled from coastal areas of Ilhéus, Bahia, Brazil, and transferred to the laboratory. Metaphase spreads were prepared from the cerebral ganglia of defecated larvae. The slides were examined and pictures of the best metaphases were taken. The chromosome number for    M.   incisus    was 2n=50 and n=25. The karyotype of this species consists of 20 metacentric and 5 submetacentric pairs. Thus, the karyotype formula of the diploid set was 2K=40M + 10SM and a fundamental number FN=100. The host species    M.   conformis    has 2n=30 and the karyotype consisting of 11 metacentric and 4 submetacentric pairs. The karyotype formula was 2K=22M + 8SM, and a fundamental number FN=60.    M.   incisus    showed a slightly higher chromosome number, placed at the marginal range of the known distribution of haploid karyotypes of the   Myrmicinae  . The chromosome number and chromosomal morphology of    M.   conformis    corresponded to those of previously studied populations, suggesting its karyotype stability.

comparative cytogenetics

Cytogenetic data on the agro-predatory ant    Megalomyrmex   incisus    Smith, 1947 and its host,    Mycetophylax   conformis    (Mayr, 1884) (  Hymenoptera  ,   Formicidae  )