ABSTRACT
Eggs and all nymphs of these species were studied employing light microscopy (LM) and scanning electron microscopy (SEM). The major differences observed by LM in the eggs were related to the presence and the distribution of pores on the surface of their chorion. Morphological differences among three nymphal stages (1st, 3rd, and 5th) development of each species were observed. The differential characteristics are chromatic and in the shape of connexival spots. The ultrastructure of the ventral region of the head and the IX, X, and XI abdominal segments (anal tube) of the both species were described demonstrating morphological differences that can be used for diagnosis of the species.
Subject(s)
Animals , Triatoma/growth & development , Microscopy, Electron, Scanning , Nymph/anatomy & histology , Nymph/ultrastructure , Ovum/ultrastructure , Triatoma/anatomy & histology , Triatoma/ultrastructureABSTRACT
The ultrastructural morphology of the ventral region of the head (rostrum and buccula) and proesternum (stridulatory sulcus) of nymphs from the 1st to 5th instars of Triatoma guazu Lent & Wygodzinsky, 1979 and Triatoma jurbergi Carcavallo, Galvão & Lent, 1998 was described. Morphological differences between the two species and of the five nymphal stages development of each species were observed. These structures showed systematic differential characteristics of the studied species and may be used to increase their taxonomic range
Subject(s)
Animals , Triatoma , Head , Microscopy, Electron, Scanning , NymphABSTRACT
There are several specific complexes belonging to the genus Triatoma Laporte, 1832, which are generally associated to specific geographic areas. Recent publications have linked the oliveirai complex to ecosystems of Mato Grosso, which are also present in other Brazilian states and even in other bordering countries as eastern Paraguay. The study of the abundant material collected during the last years allowed the description of several new species of the oliveirai complex: T. jurbergi Carcavallo, Galväo & Lent, 1998; T. baratai Carcavallo & Jurberg, 2000 and T. klugi Carcavallo, Jurberg, Lent & Galväo, 2001. Another new species belonging to the same complex is described here as T. vandae sp.n. It originates from the state of Mato Grosso, and has been reared in the insectary of the Laboratório Nacional e Internacional de Referência em Taxonomia de Triatomíneos, Departamento de Entomologia, Instituto Oswaldo Cruz-Fiocruz, Rio de Janeiro
Subject(s)
Animals , Male , Female , Triatominae , Brazil , TriatominaeABSTRACT
Eggs and nymphs of Triatoma jurbergi were described using optical microscopy and scanning electron microscopy. T. jurbergi is a wild species, found in State of Mato Grosso (15ºS and 300 m.a.s.l), Brazil. Eggs showed the operculum and surface with pentagonal and hexagonal cells, with small fractures and punctuations randomly distributed. Differences were found in the five nymphal stages of T. jurbergi, that allow their to be distinguished from the similar species T. guazu. The diagnostic characters most useful for differentiation were the general color of the insect, abdomen shape and its length
Subject(s)
Animals , Triatoma , Microscopy, Electron, Scanning , Nymph , OvumABSTRACT
OBJETIVO: Avaliar as diferenças significativas de desenvolvimento ninfal da espécie Rhodnius robustus Larrousse, 1927, submetida a diferentes condiçöes de temperatura e umidade, que se encontra distribuída na regiäo Norte do Brasil (Acre, Amazonas e Pará) e na Colômbia, no Equador, no Peru e na Venezuela. MÉTODOS: Formaram-se três grupos de Rhodnius robustus, mantidos em diferentes condiçöes de laboratório: 33/40 (33+/-1oC e 40+/-5 por cento UR ó umidade relativa), 33/70 (33+/-1oC e 70+/-5 por cento UR) e 28/70 (28+/-1oC e 70+/-5 por cento UR), para observar o período de incubaçäo dos ovos, o desenvolvimento de cada estádio, os percentuais de mortalidade e os número de repastos realizados. RESULTADOS: O menor período médio de desenvolvimento ninfal foi observado no grupo 28/70 com as médias: 14,4; 17,3; 20,3; 22,8 e 40. O desenvolvimento embrionário apresentou diferenças significativas entre os tratamentos utilizados (p<0,01). O número de repastos teve aumento gradual com a aproximaçäo da fase adulta em todos os grupos testados, exceto no terceiro estádio do grupo 33/70. Os menores percentuais de mortalidade foram os do grupo 28/70. CONCLUSOES: Temperaturas elevadas, independentes das umidades associadas, podem acelerar o ciclo biológico da espécie. Entretanto, elas podem prejudicar a sobrevivência das colônias, impedindo sua manutençäo em laboratório
Subject(s)
Rhodnius , Triatominae , Chagas Disease/transmissionABSTRACT
The authors describe a new species of Triatominae (Hemiptera, Reduviidae) from the State of Rio Grande do Sul, Brazil. The study was made with specimens captured in basaltic formations, at an average altitude of 750 m.o.s.l. The new species is included in the oliveirai complex together with other four species T. williami, T. matogrossensis, T. guazu and T. jurbergi). The new species was compared with the most similar one, T. oliveirai, from which the main differences are on the proportions of head, ante and postocular regions, the general color pattern and the male genitalia, specially on the median process of the pygophore, the support of phallosome, the vesica and the process of the endosome
Subject(s)
Animals , Male , Female , Triatominae/classification , Brazil , Sex Differentiation , Triatominae/anatomy & histology , Triatominae/geneticsABSTRACT
The flight initiation of T. infestans, the main vector of Chagas disease in the Southern Cone countries of Latin America, and of the closely-related species T. melanosoma was studied in laboratory. The results demonstrated that after the beginning of observations the peak of the flight activity was about 14 days after feeding in both species and it was usually more marked in the females than in the males, but there were no significant differences in the flight behaviour of the two species
Subject(s)
Animals , Male , Female , Flight, Animal/physiology , Triatoma/physiology , Behavior, Animal/physiology , Sex FactorsSubject(s)
Humans , Animals , Chagas Disease/transmission , Insect Vectors/physiology , Triatominae/physiology , TemperatureABSTRACT
Panstrongylus rufotyberculatus is reported for the first time in Argentina. Four adults were attracted by the light of human dwellings in Calilegua National Park, Jujuy, at 1150 masl within the subtropical humid forest. The indiviluals were similar to those described in the literature. The epidemiological significance of this species is very low in the area, although deforestation might increase its role in the transmission of Trypanosoma cruzi.
Subject(s)
Animals , Disease Vectors , Chagas Disease/epidemiology , Insect Vectors , PanstrongylusABSTRACT
Triatoma bassolsae sp. n. from Mexico with a key to species of "phyllosoma" complex - According to the descriptions of five closely related species of the genus Triatoma Laporte, 1832: T. phyllosoma (Burmeister, 1835), T. pallidipennis (Stal, 1872), T. picturata Usinger, 1939, T. longipennis Usinger, 1939 and T. mazzottii Usinger, 1941 and further published studies, these species could be included in a "specific complex" named as the species formerly described. All these species are typical from Mexico and another species was found in the same country, in the State of Puebla: Triatoma bassolsae sp. n. This species was morphologically compared with the other five of the "phyllosoma" complex, including the external male genitalia. The most important characters used to separate T. bassolsae from T. phyllosoma (which is the most similar to the other species) are the morphometric relationships on the head, with a longer anteocular regin and a significant longer second restral segment, a long and conspicuous pilosity in different areas of the body and specially on the head, and the charcters of the anterolateral, lateral and discal tubercles of the pronotum, very long and sharp in the new species. The male genitalia has several differences between T. bassolsae and T. phyllosoma specially significant on the surface of the endosome process and on the branches of the phallosome support, separated at the apex in the new species. Types and paratypes are incorporated in the respective institutions in Mexico DF and Rio de Janeiro.
Subject(s)
Animals , Triatoma/classification , Triatominae/classificationABSTRACT
Triatoma jurbergi, n. sp. is described based on nine specimens of both sexes deposited in Rodolfo Carcavallo Collection in the Oswaldo Cruz Institute Entomological Collection. The new species can be separated from the closely related Triatoma guazu Lent & Wygodzinsky, 1979 by several characters. The must important are longer anteocular region; thin and pointed juga; the shape of the eyes without concavity in the posterior edge; much longer second rostral segment, passing the posterior edge of eyes; the absence of a ventral longitudinal depression on the abdomen; the general color redish, brown and orange and the male genitalia, mainly in the vesica lightly chitinized and smaller, the phallosome with apical projection and the pointed apex of the endosome process.
Subject(s)
Animals , Triatoma/anatomy & histology , BrazilABSTRACT
Säo apresentados aspectos da morfologia externa, da mensuraçäo e do exocório de ovos em nove dos quinze gêneros, atualmente conhecidos, de Triatominae: Alberprosenia, Carvenicola, Dipetalogaster, Eratyrus, Microtriatoma Panstrongylus, Psammolestes, Rhodnius e Triatoma. Foram analisadas as características da fixaçäo ou näo ao substrato, mensuraçäo do diâmetro e do comprimento, forma e textura da casca, do ovo e do opérculo, assim como a arquitetura do exocório observada através de microscopia óptica (M.O.) e microscopia eletrônica de varredura (M.E.V.), conforme trabalhos anteriores (Barata et al., 1980; Barata, 1981)
Subject(s)
Disease Vectors , Triatominae/anatomy & histology , Ovum , Triatominae/growth & developmentABSTRACT
Aborda os estágios ninfais da eclosäo do ovo até chegar à fase adulta
Subject(s)
Disease Vectors , Nymph/anatomy & histology , Triatominae/growth & developmentABSTRACT
Apresenta um esquema básico da anatomia dos triatomíneos que deve ser considerado como um guia. Neste sentido, säo mostradas algumas das características anatômicas e morfológicas sem se analisar qualquer espécie em particular
Subject(s)
Anatomy , Disease Vectors , Triatominae/anatomy & histologyABSTRACT
Analisa a importância das casas e ambientes periféricos como habitats das colônias de triatomíneos para quantificar os fatores de risco para o diagnóstico e prevençäo da Doença de Chagas (CAC)
Subject(s)
Humans , Animals , Disease Vectors , Chagas Disease/prevention & control , Triatominae , Chagas Disease/diagnosis , Housing , Insect VectorsABSTRACT
A female of triatoma of Triatoma guazu & Wygodzinsky, 1979, a rare species from which the allotype was recently described, was studied by scanning electronic microscopy and videomicroscope. Some structures of the head and the thorax are shown. Some of them could have taxonomic importance, as the oculto-ocellar region, the buccula, the anterolateral angle of the collar, the scutellum, wings and the stridulatory sulcus, which has as unusual lateral high rim.