Insects of the order Hemiptera (Heteroptera) are considered the largest group of insects with incomplete metamorphosis. Representatives of the Gerromorpha and Nepomorpha infraorders are found in the Brazilian Savanna (Cerrado Biome). This manuscript provides information about the occurrence and distribution of families and genera that occur in the states of the Cerrado Biome, deposited in the UnB Aquatic Invertebrate Collection (CIAq-UnB). The collection started in 1995 and have aquatic specimens of Cerrado Biome. An identification key is also presented for the families and genera that occur in this region.

Espírito Santo is a Brazilian state that has a wide variety of habitats, providing a high biological diversity of fauna and flora. However, few reports had been shown about the insect diversity of this region, especially of heteropterans insects that inhabit on pasture ecosystems. In the present study, forty-three species of Heteroptera belonging to thirteen families were collected on pastures on Espírito Santo state, Brazil: Alydidae (1 sp.), Berytidae (3 sp.), Blissidae (1 sp.), Coreidae (7 sp.), Miridae (16 sp.), Nabidae (1sp.), Pentatomidae (3 sp.), Pyrrhocoridae (1 sp.), Reduviidae (6 sp.), Rhopalidae (1 sp.), Rhyparochromidae (1sp.), Thaumastocoridae (1 sp.) and Tingidae (1 sp). Among the species; Cebrenis tenebrosa (Brailovsky, 1995) is recorded for the first time in Brazil. The range extension is also included for several heteropterans collected on the Espírito Santo state. The following species: Blissus aff. antillus (Leonard, 1968); Collaria oleosa (Distant, 1883); Oebalus ypsilongriseus (De Geer, 1773), and Trigonotylus tenuis (Reuter, 1893) were observed causing damages on pastures, therefore, in this study, we suggested those species as potential pastures pests. This study aims to increase the knowledge about the heteropterans and to show the presence of some pest species that may cause serious damage to pastures and consequently affect the economy of cattle breeders on the state.