Diversity and distribution of aquatic True Bugs (HEMIPTERA: HETEROPTERA: NEPOMORPHA) in the CAATINGA
Biome. 2024. f. Thesis. (PhD. in Animal Biology. Instituto de Ciências Biológicas e da Saúde. Universidade Federal Rural do Rio de Janeiro. Seropédica. RJ
Aquatic insects, Caatinga, Insect survey, Species Distribution Modeling, Taxonomy
"The Brazilian biodiversity, especially concerning entomological knowledge, poses a significant challenge to science. This gap is more pronounced in aquatic insects, which are crucial for understanding anthropogenic impacts, habitat stability, and ensuring the quality of water resources in each biome. Among the Brazilian biomes, one of the least known and sampled is the Caatinga. It has a strictly national distribution, present in nine states in the Northeast, partially in part of Minas Gerais. Nevertheless, it is undersampled, possibly due to the perception that the Semi-Arid region would not exhibit great biodiversity, a hypothesis refuted by the high degree of endemism of fish and amphibians in this Domain. A more in-depth knowledge of its biodiversity would fill distribution gaps, assisting biogeographical and conservation studies. In the country, there is a significant projection of insect taxa yet to be discovered, with many of them possibly becoming extinct even before being described. The order Hemiptera is among the most diverse in the national territory, with approximately 30 thousand registered species. Faced with the challenges posed by the accelerated extinction of the Anthropocene, new approaches are necessary to establish conservation areas for these species. Among them, Potential Distribution Modeling can assist in proposing regions for more effective and comprehensive Conservation Units, based on species presence records and environmental variables, a technique aligned with the magnitude of Brazilian biodiversity. In this work, three new species of the infraorder Nepomorpha were found, belonging to the genera Tenagobia (Hemiptera: Micronectidae), Australambrysus (Hemiptera: Naucoridae), and Ochterus (Hemiptera: Ochteridae) in total. Additionally, unprecedented distribution records for the infraorder were made in the states of Alagoas (28), Bahia (14), Ceará (14), Pernambuco (11), Piauí (8), and Sergipe (23). Furthermore, a taxonomic identification key for the family Notonectidae was proposed for the Northeast of Brazil, and Potential Distribution Models were developed for the species Buenoa amnigenus, Belostoma anurum, B. dallasi, B. foveolatum, Buenoa fuscipennis, Buenoa konta, Buenoa micantulum, Buenoa mutabilis, Buenoa platycnemis, Belostoma plebejum, Buenoa salutis, Buenoa tarsalis, Buenoa unguis, Centrocorisa kollari, Gelastocoris flavus, Heterocorixa wrighti, Lethocerus annulipes, Limnocoris pusillus, Martarega bentoi, M. brasiliensis, M. membranacea, Maculambrysus stali, and Notonecta disturbata.