Checklist de percevejos aquáticos e semi-aquáticos (Heteroptera: Insecta) da sub-bacia do Baixo Parnaíba, Piauí, Brasil

Abstract

The neotropical fauna of aquatic and semiaquatic Heteroptera is relatively well known, but there may be several undescribed species due to the extensive areas that have never been sampled. Currently, 24 species of Heteroptera have been recorded for Piauí, 12 species from the infraorder of Gerromorpha and 12 species from Nepomorpha. The discovery of new species, even within known groups, contributes to increase knowledge about heteropteran diversity and refines our knowledge of taxa present in a given space. Aiming to provide an advance in scientific knowledge, the objectives of this study were: to develop taxonomic studies on aquatic and semi-aquatic stink bugs in the Baixo Parnaíba Sub-basin, in the State of Piauí. Rivers and streams were sampled for two to three days during six months in dry and rainy seasons. The collection of adults in the field was carried out with an aquatic entomological net, sieve and Pennsylvania traps and a white sheet. A total of 136 specimens were found, distributed in nine families, 14 genera, 29 species of Heteroptera (Gerromorpha and Nepomorpha). Of these, five are new records for the state of Piauí: Limnogonus recurvus Drake & Harris, 1930, Limnocoris burmeiteri de Carlo, 1957, Pelocoris bipunctulus Herrich-Schaeffer, 1853, Pelocoris poeyi Guéri mèneville, 1835, Rhagovelia robusta Goulart, 1931 and Rhagovelia tenuipes Champion, 1898.