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Insects of the suborder Heteroptera are known for their odor, for being pests, or for being disease carriers. To gain better insight into the cytogenetic characteristics of heteropterans, 18 species of terrestrial Heteroptera belonging to eight families were studied. The presence of heteropycnotic corpuscles during prophase I, terminal or interstitial chiasmas, telomeric associations between chromosomes, ring disposals of autosomes during metaphase, and late migrations of the sex chromosomes during anaphase were analyzed. These features showed identical patterns to other species of Heteroptera previously described in the literature. Another studied characteristic was chromosome complements. The male chromosome complements observed were 2n = 12 chromosomes [10A XY, Galgupha sidae (Amyot & Serville) (Corimelaenidae) and Pachycoris torridus (Scopoli) (Scutelleridae)]; 2n = 13 [10A 2m X0, Harmostes serratus (Fabricius), Harmostes apicatus (Stål), Jadera haematoloma (Herrich-Schaeffer), Jadera sanguinolenta (Fabricius), Jadera sp. (Rhopalidae)], and Neomegalotomus parvus (Westwood) (Alydidae); 2n=13 [12A X0, Stenocoris furcifera (Westwood) (Alydidae); 2n = 14 [12A XY, Dictyla monotropidia (Stål) (Tingidae)]; 2n = 19 [18A X0, Acanonicus hahni (Stål) (Coreidae)]; 2n = 21 [18A 2m X0, Acanthocephala sp. (Dallas) (Coreidae)]; 2n = 27 [244 2m X0, Anisoscelis foliacea marginella (Dallas) (Coreidae)]; 2n = 18 [16A XY, Oncopeltus fasciatus (Dallas) (Lygaeidae)]; 2n = 17 [14A X1X2Y, Oxycarenus hyalinipennis (Costa) (Lygaeidae)]; 2n = 16 [12A 2m XY, Pachybrachius bilobatus (Say) (Lygaeidae)]; 2n = 26 [24A XY, Atopozelus opsinus (Elkins) (Reduviidae)]; and 2n = 27 [24A X1X2Y, Doldina carinulata (Stål) (Reduviidae)]. The diversity of the cytogenetic characteristics of Heteroptera was reflected in the 18 studied species. Thus, this study extends the knowledge of these characteristics, such as the variations related to chromosome complements, sex chromosome systems, and meiotic behavior.