First report of Rhodnius neglectus (Hemiptera, Reduviidae, Triatominae) from the State of Acre, Brazil, and the Brazilian Western Amazon Region (original) (raw)
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Revista da Sociedade Brasileira de Medicina Tropical, 2016
Introduction: This paper reports, for the first time, the presence of Rhodnius stali in the state of Acre and in the Brazilian Amazon. Methods: Specimens of R. stali were collected by the Federal University of Acre in Rio Branco. Results: The number of Triatominae species in the State of Acre increased from five to six. This was also the first report of R. stali in the Brazilian Amazon. Conclusions: The occurrence of R. stali is worrisome, since this species has been found naturally infected by Trypanosoma cruzi and there has been evidence of its domiciliation capabilities.
Revista da Sociedade Brasileira de Medicina Tropical, 2019
Introduction: The present study reports the presence of triatomines in natural, peridomestic, and intradomicile environments in Itacoatiara municipality, state of Amazonas, a non-endemic region for Chagas disease. Methods: Active search was performed inside tree trunks, and palm trees, residences, and peridomiciles localized near the forest area. Results: Twenty adults and ten triatomines nymphs were collected, fifteen of which were from natural forests, thirteen from intradomiciles, and two from peridomicile areas. Conclusions: The new records of adults and nymphs of triatomines in the intra-and peridomiciles suggest the adoption of prophylactic measures for vector surveillance in the study area.
Revista da Sociedade Brasileira de Medicina Tropical, 2020
INTRODUCTION: Rhodnius domesticus Neiva & Pinto, 1923 is a rare sylvatic triatomine endemic to the Atlantic Forest, with one known record for Espírito Santo (ES), Brazil from 1969. We present here its rediscovery in ES, 42 years after its first record. METHODS: In January 2011, a triatomine specimen was collected from a rural area of the municipality of Santa Teresa, ES. RESULTS: We confirmed this as a new record of R. domesticus in the Baixo Caldeirão locality. CONCLUSIONS: This finding supports the possibility of a wild population of R. domesticus in the mountainous region of the Atlantic forest of ES.
Rhodnius barretti, a new species of Triatominae (Hemiptera: Reduviidae) from western Amazonia
Memórias do Instituto Oswaldo Cruz, 2013
Rhodnius barretti, a new triatomine species, is described based on adult specimens collected in rainforest environments within the Napo ecoregion of western Amazonia (Colombia and Ecuador). R. barretti resembles Rhodnius robustus s.l., but mitochondrial cytochrome b gene sequences reveal that it is a strongly divergent member of the "robustus lineage", i.e., basal to the clade encompassing Rhodnius nasutus, Rhodnius neglectus, Rhodnius prolixus and five members of the R. robustus species complex. Morphometric analyses also reveal consistent divergence from R. robustus s.l., including head and, as previously shown, wing shape and the length ratios of some anatomical structures. R. barretti occurs, often at high densities, in Attalea butyracea and Oenocarpus bataua palms. It is strikingly aggressive and adults may invade houses flying from peridomestic palms. R. barretti must therefore be regarded as a potential Trypanosoma cruzi vector in the Napo ecoregion, where Chagas disease is endemic.
Revista da Sociedade Brasileira de Medicina Tropical, 2021
Introduction: Triatomines are hematophagous insects that are important to public health since they are the vectors of American Trypanosomiasis. The objective of this study was to describe the occurrence of triatomines in homes in Cruzeiro do Sul, Acre, Brazil. Methods: The specimens were collected by an active search inside homes and also by a passive search by the residents. Results: A total of 55 triatomines were captured comprising of 5 species each of the genera Rhodnius, Eratyrus, and Panstrongylus. No colonies were detected, ruling out the possibility of domiciliation. Conclusions: Information on regional epidemiological dynamics contributes to the prevention and control of disease.
ZooKeys, 2016
Rhodnius marabaensis sp. n. was collected on 12 May 2014 in the Murumurú Environmental Reserve in the city of Marabá, Pará State, Brazil. This study was based on previous consultation of morphological descriptions of 19 Rhodnius species and compared to the identification key for the genus Rhodnius. The examination included specimens from 18 Rhodnius species held in the Brazilian National and International Triatomine Taxonomy Reference Laboratory in the Oswaldo Cruz Institute in Rio de Janeiro, Brazil. The morphological characteristics of the head, thorax, abdomen, genitalia, and eggs have been determined. Rhodnius prolixus and R. robustus were examined in more detail because the BLAST analysis of a cyt-b sequence shows they are closely related to the new species, which also occurs in the northern region of Brazil. The most notable morphological features that distinguish R. marabaensis sp. n. are the keel-shaped apex of the head, the length of the second segment of the antennae, the shapes of the prosternum, mesosternum and metasternum, the set of spots on the abdomen, the male genitalia, the posterior and ventral surfaces of the external female genitalia, and the morphological characteristics of the eggs. Rhodnius jacundaensis Serra, Serra and Von Atzingen (1980) nomen nudum specimens deposited at the Maraba Cultural Center Foundation-MCCF were examined and considered as a synonym of R. marabaensis sp. n.
Revista da Sociedade Brasileira de Medicina Tropical, 2014
Introduction: Chagas disease transmitted by the Triatoma infestans was eradicated from Brazil in 2006. However, reports of triatomine foci threaten the control of Chagas disease. The goal of this study was to determine T. infestans foci in the City of Ibipeba, State of Bahia. Methods: Triatominae specimens were collected in Ibipeba and entomologic indicators were calculated using indices of domiciliary infestation, density, and colonization. Results: T. infestans foci was discovery in Ibipeba, State of Bahia. Approximately 95% of the specimens were discovered inside dwellings, of which 34% were T. infestans. This species was also discovered forming a colony in tree bark in the peridomicile. Conclusions: Triatoma infestans foci in peridomestic ecotopes in Ibipeba, BA, indicate increased the risk of transmission Chagas disease.
Zootaxa
We present here a multisource approach that takes advantage of several disciplines to address a taxonomic issue. A triatomine related to Rhodnius robustus Larrousse, 1927 was recently found in the state of Rondônia, Brazil. The name Rhodnius montenegrensis n. sp. is suggested because it was found in the municipality of Monte Negro. The main differences between these two species can be detected in the female and male genitalia, but there are also noticeable differences in their eggs. Molecular analysis using PCR-RFLP technique and Bayesian inferences based on a fragment of the Cytochrome b (Cyt b) gene corroborated the morphological findings. We used this integrative approach to address the taxonomic decision for a new Rhodnius species and its relationship with others of this genus. Results obtained herein stress that morphology must be used as the major approach for obtaining phenotypic information, and molecular data should be taken as a complementary tool.
2021
Introduction: The objective of this work was to study Triatomine fauna captured during the period from 2006–2014 in Mato Grosso do Sul and to investigate the influence of climatic elements on these populations by providing subsidies to guide vector control work in the state. Methods: We verified the natural infection rate, the abundance of classes, constancy, frequency and dominance, and the influence of climatic factors on the frequency of triatomine. Results: Of the 14,178 specimens collected, 2,118 (14.94%) were domiciliary, and 12,060 (85.06%) were peridomiciles. The rate of natural infection in Triatoma matogrossensis was 18.18%, followed by Rhodnius neglectus (0.46%) and Triatoma sordida (0.27%). Triatoma sordida was the most frequent species: constant, abundant and dominant. We observed the influence of climatic factors on the encounter of insects during the period from January to December and throughout the eight years of the study period. Climatic factors such as relative h...