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The subfamily   Harpactorinae   is composed of six tribes. Phylogenetic studies bring together some of   Harpactorinae   tribes, but by and large the data on evolutionary relationships of the subfamily are scarce. Chromosome studies are of great importance for understanding the systematics of different groups of insects. For   Harpactorinae  , these studies are restricted to some subfamilies and involved only conventional chromosome analysis. This work analyzed cytogenetically    Ricolla   quadrispinosa    (Linneus, 1767). The chromosome number was determined as 2n = 24 + X 1 X 2 Y in males. In metaphase II the autosomal chromosomes were organized in a ring with the pseudo-trivalent of sex chromosomes in its center. After C-banding followed by staining with  DAPI , AT-rich blocks in autosomes were observed and the negatively heteropycnotic sex chromosomes. The data obtained, together with existing data for other species of the group, indicated that different chromosomal rearrangements are involved in the evolution of the species. In addition, a proposal of karyotype evolution for the subfamily, based on existing phylogenetic studies for the group is presented.

comparative cytogenetics

Analysis of the karyotype structure in    Ricolla   quadrispinosa    (Linneus, 1767): inferences about the chromosomal evolution of the tribes of   Harpactorinae   (  Heteroptera  ,   Reduviidae  )