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Triatoma mexicana Herrich-Schaeffer (Hemiptera: Reduviidae: Triatominae) Descripción de la Genitalia Externa del Macho y Morfología Externa de la Hembra Triatoma mexicana Herrich-Schaeffer (Hemiptera: Reduviidae: Triatominae) Description of the External Male Genitalia and External Morphology of the Female  [cached]
Paz María Salazar Schettino,Gloria Elena Rojas Wastavino,José Santiago Rosales Pi?a,Mauro Omar Vences Blanco
EntomoBrasilis , 2013, DOI: 10.12741/ebrasilis.v6i1.275
Abstract: Triatoma mexicana fue descrita originalmente en 1848 por Herrich-Schaeffer nombrándola Conorhinus mexicanus Herrich-Schaeffer. Actualmente se registra su hallazgo en los estados de Guanajuato, Hidalgo Querétaro y San Luis Potosí. Los estudios sobre su distribución espacial, índices entomológicos, presencia en el intradomicilio y peridomicilio, biología y riesgo de transmisión de Trypanosoma cruzi Chagas demuestran que es una especie importante desde el punto de vista de salud pública. Con el propósito de ampliar el conocimiento biológico sobre la especie, en el presente estudio se hace la descripción de la hembra así como la genitalia externa del macho, en ejemplares capturados en el estado de Guanajuato. Triatoma mexicana was originally described in 1848 by Herrich-Schaeffer, naming Conorhinus mexicanus Herrich-Schaeffer. Its finding is currently registered in the States of Guanajuato, Hidalgo, Querétaro, and San Luis Potosí. Studies about the spatial distribution, the entomological indices, it presence indoor an outdoor in houses, it biology and risk of transmission of Trypanosoma cruzi Chagas show that it is an important species from the point of view of public health. With the purpose of extending the biological knowledge of this species, the present study is the description of the female as well as the external male genitalia, in specimens captured in the State of Guanajuato.
Biologic Development of Triatoma mexicana (Herrich-Schaeffer 1848) (Hemiptera: Reduviidae: Triatominae) under Laboratory Conditions
M.A. Becerril-Flores,A. Aguilar-Hernandez,J.L. Imbert-Palafox
International Journal of Tropical Medicine , 2012,
Abstract: Triatoma mexicana is one of the triatomine species whose biologic development is yet unknown, but it is frequently reported to be infected by Trypanosoma cruzi. In this research, we explore the life cycle and reproductive and feeding patterns of T. mexicana under laboratory conditions. Ten female and 12 male insects were collected to make up a artificial colony. The deposited eggs were maintained in the laboratory under 3 different conditions: 27 C and 66% humidity, 26 C and 35% humidity and 19 C and 45% humidity (these last were room temperature and humidity). Nymph and adult insects were fed on CD-1 mice and chicken once a week in order to study the alimentary preference of this triatomine species. Our observations were that 71.5% of successful hatching took place at 27 C and 66% humidity, therefore were the better environmental conditions for T. mexicana. Out of successfully hatched ones, 8% survived till adulthood, in which 2.5% were males and 5.5% were females, at the end of 338.66 35.38 days. In the adult phase, the insects survived between 100 and 190 days. In 1st to 4th instars, T. mexicana was fed for 1-3 times; in 5th instar for 1-4 times and in adulthood for 3-7 times. Each feeding occurred at an interval of 15-34 days. The morphologic characteristics of every instar phase are described by photographs. Through this research, biologic cycle and survival conditions of T. mexicana were explored for the first time.
Influence of temperature and humidity on the biology of Triatoma mexicana (Hemiptera: Reduviidae: Triatominae) under laboratory conditions
Martínez-Ibarra, José Alejandro;Salazar-Schettino, Paz María;Solorio-Cibrián, Miriam;Cabrera Bravo, Margarita;Novelo-López, Mónica;Vences, Mauro Omar;Montes-Ochoa, Jazmín Yesenia;Nogueda-Torres, Benjamín;
Memórias do Instituto Oswaldo Cruz , 2008, DOI: 10.1590/S0074-02762008000700015
Abstract: several biological parameters related to the triatoma mexicana life-cycle were evaluated in this study. three cohorts were maintained under different combinations of temperature and relative humidity (rh): 25oc/50% rh; 25oc/75% rh; and 30oc/75% rh. observed hatching rates varied from 49-57.5% whereas the average time of hatching varied from 19.5-22.7 days. in the three cohorts studied, the mean time-lapse between presentation of the blood meal and the beginning of feeding was less than 5 min in all instars; the mean feeding time was longer than 10 min in all the instars; the post-feed defecation delay was over 10 min in all the instars. less than 50% of nymphs in each cohort completed the cycle and the average time from 1st instar nymph to adult was more than 255 days for the three cohorts. the number of blood meals before molt at each nymphal instar varied from 1-9. our results appear to indicate a lack of influence of temperature and rh on the biological parameters of t. mexicana that were studied, which could reflect the adaptation capacity of this species. we also conclude that t. mexicana can not be considered an effective transmitter of trypanosoma cruzi to human populations in areas where this species is currently present.
Fungal flora of the digestive tract of Triatoma infestans (Hemiptera: Reduviidae) from Argentina
Marti,G. A.; García,J. J.; Cazau,M. C.; López Lastra,C. C.;
Bolet?-n de la Sociedad Argentina de Bot??nica , 2007,
Abstract: a survey of the fungal microbiota of the digestive tract of triatoma infestans (klug) (hemiptera: reduviidae) adults was carried out. insects captured in the field from different provinces in argentina, as well as individuals reared in artificial colonies, were used for dissection. axenic cultures of the fungal species were identified and were deposited with mycological collections at la plata , argentina. a total of 33 fungal species, with the exception of three that were mycelia sterilia, belonging to 11 genera were identified. thirty two species belonged to ascomycota (eurotiomycetes and sordariomycetes) and one to zygomycota (zygomycetes). the genera with the greatest number of species were penicillium (15), aspergillus (5), and cladosporium (2). among the isolated fungi, some of the species were entomopathogenic or pathogens of humans and other animals.
Genetic variability of Triatoma flavida and Triatoma bruneri (Hemiptera: Reduviidae) by RAPD-PCR technique
Fraga, Jorge;Rodriguez, Jinnay;Fuentes, Omar;Hernández, Yenin;Castex, Mayda;Gonzalez, Raul;Fernández-Calienes, Aymé;
Revista do Instituto de Medicina Tropical de S?o Paulo , 2011, DOI: 10.1590/S0036-46652011000100004
Abstract: the triatominae (hemiptera:reduviidae) contains the principal and potential chagas disease vectors present in mexico, central america and south america. triatoma flavida and t. bruneri are cuban species. these species are closely related according to morphology and were considered synonyms until 1981, when they were separated on the grounds of external characters of the body and the morphology of male genitalia. the present study seeks to analyze genetic polymorphism of t. flavida and t. bruneri populations using rapd techniques, and to assess the genetic relationship between these species. ten random primers were used to evaluate the genetic variability among species using rapd-pcr. the genetic flow among them was calculated. the dendrogram based on calculated jaccard distances showed two clearly distinguishable clusters which coincided with the studied species. within each species, moderate genetic differentiation (fst 0.05-0.15) and migration rates (n > 1) were found among populations, that reveal gene flow and genetic homogeneity. between species, the fst value showed a high genetic differentiation and the migration rate was insufficient to maintain genetic homogeneity, and confirmed the absence of gene flow between them. our results confirm the genetic variability among t. flavida and t. bruneri species.
Fungal flora of the digestive tract of Triatoma infestans (Hemiptera: Reduviidae) from Argentina Flora fúngica de tractos digestivos en Triatoma infestans (Hemiptera: Reduviidae) en Argentina  [cached]
G. A. Marti,J. J. García,M. C. Cazau,C. C. López Lastra
Boletín de la Sociedad Argentina de Botánica , 2007,
Abstract: A survey of the fungal microbiota of the digestive tract of Triatoma infestans (Klug) (Hemiptera: Reduviidae) adults was carried out. Insects captured in the field from different provinces in Argentina, as well as individuals reared in artificial colonies, were used for dissection. Axenic cultures of the fungal species were identified and were deposited with mycological collections at La Plata , Argentina. A total of 33 fungal species, with the exception of three that were mycelia sterilia, belonging to 11 genera were identified. Thirty two species belonged to Ascomycota (Eurotiomycetes and Sordariomycetes) and one to Zygomycota (Zygomycetes). The genera with the greatest number of species were Penicillium (15), Aspergillus (5), and Cladosporium (2). Among the isolated fungi, some of the species were entomopathogenic or pathogens of humans and other animals. En el presente estudio se realizó un relevamiento de la flora fúngica microbiana en tractos digestivos de adultos de Triatoma infestans (Klug) (Hemiptera: Reduviidae). Se disecaron insectos capturados del campo en diferentes provincias Argentinas, así como también se utilizaron individuos de una colonia artificial. Fueron realizados cultivos axénicos de las especies fúngicas aisladas, los que fueron identificados y luego depositados en las colecciones de hongos entomopatógenos del CEPAVE La Plata , Argentina. Fueron identificadas 33 especies fúngicas perteneciente a 11 géneros. Treinta y dos especies pertenecen a Ascomycota (Eurotiomycetes y Sordariomycetes) y una a Zygomycota (Zygomycetes). Los géneros con mayor número de especies fueron Penicillium (15), Aspergillus (5), y Cladosporium (2). Entre los aislamientos fúngicos, algunas de las especies encontradas son entomopatogénicas o patógenas de humanos y otros animales.
Alguns aspectos da biologia de Triatoma pseudomaculata Corrêa & Espínola, 1964, em condi??es de laboratório (Hemiptera:Reduviidae:Triatominae)
Memórias do Instituto Oswaldo Cruz , 1997, DOI: 10.1590/S0074-02761997000200024
Abstract: biology of triatoma pseudomaculata corrêa & espínola, 1964, under laboratory conditions (hemiptera:reduviidae:triatominae) - observations were made on the evolutive cycle of triatoma pseudomaculata, held under laboratory conditions, fed weekly on bird (pigeon). of 60 eggs obtained, only 34 nymphs reached the adult stage in a period of x(s)=398±76 days. the following parameters were observed: the time immature stages took to develop from egg to adult emergence; the occurrence of the first meal; the time-lapse between the presenting of the blood-meal and the begining of feeding; time of feeding; amount of blood ingested; variation of weight 24 hr after the blood-meal and until the next blood-meal; and the defecation pattern. the experiment was carried out for 20 months, held in bod incubator with the average of temperature and humidity of 28±1oc and 80±5% ru, respectively
Alguns aspectos da biologia de Triatoma pseudomaculata Corrêa & Espínola, 1964, em condi es de laboratório (Hemiptera:Reduviidae:Triatominae)  [cached]
Gon?alves Teresa Cristina M,Cunha Vanda,Oliveira Edson de,Jurberg José
Memórias do Instituto Oswaldo Cruz , 1997,
Abstract: Biology of Triatoma pseudomaculata Corrêa & Espínola, 1964, under Laboratory Conditions (Hemiptera:Reduviidae:Triatominae) - Observations were made on the evolutive cycle of Triatoma pseudomaculata, held under laboratory conditions, fed weekly on bird (pigeon). Of 60 eggs obtained, only 34 nymphs reached the adult stage in a period of X(S)=398±76 days. The following parameters were observed: the time immature stages took to develop from egg to adult emergence; the occurrence of the first meal; the time-lapse between the presenting of the blood-meal and the begining of feeding; time of feeding; amount of blood ingested; variation of weight 24 hr after the blood-meal and until the next blood-meal; and the defecation pattern. The experiment was carried out for 20 months, held in BOD incubator with the average of temperature and humidity of 28±1oC and 80±5% RU, respectively
índice de defecación y éxito reproductivo de Triatoma maculata (Hemiptera:Reduviidae)en condiciones de laboratorio
Aldana,E; Lizano,E;
Revista de Biología Tropical , 2004,
Abstract: defecation index and reproductive success of triatoma maculata (hemiptera: reduviidae) under laboratory conditions.the reproductive and defecating behavior of triatoma maculata (erichson 1848)was studied on animals from an university culture in venezuela.this species does not reach the importance of rhodnius prolixus stal 1859 as chagas disease vector in venezuela.this study addressed the role of defecating frequency,an index of how dangerous the animals are for the human population,and its relationship with why t.maculata is a less important vector than r.prolixus .human blood was fed to the insects through an artificial feeding device.the 2nd and 3rd instar nymphs defecated more frequently (id=0.6,n=40),and our vth instar nymphs did not complete sexual differentiation.fertility was 55%(n=865)and fecundity 8 eggs/female/week (n=26). egg incubation lasted 22 days (n=477).female longevity was 51 days (n=26).intermould time grew progressively from 35 days for 1st to 40 days for 4th instar nymphs (n=40).mould percentage varied from 0% for vth to 63%for 3rd instar nymphs.mortality varied from 8% for 3rd to 100% for vth instar nymphs.these results support evidences explaining the lesser vectorial capacity and low density of t.maculata in human domiciles, including reduced reproduction and defecation when the animal feeds on human blood.rev.biol.trop.52(4): 927-930.epub 2005 jun 24.
Perfil electroforético de proteínas presentes en la saliva de Triatoma dimidiata (Hemiptera: Reduviidae:Triatominae) Electrophoretic profile of salivary proteins of Triatoma dimidiata (Hemiptera: Reduviidae:Triatominae)  [cached]
Mónica Flórez,Rocío del Pilar Ni?o,Rodrigo Gonzalo Torres,Gerardo Mu?oz
Revista de la Universidad Industrial de Santander. Salud , 2009,
Abstract: Introducción: Los triatominos (Hemiptera: Reduviidae:Triatominae) son insectos hematófagos que secretan una saliva rica en proteínas con propiedades anticoagulantes, antihistamínicas, vasodilatadoras y antiplaquetarias que facilitan su proceso de alimentación en el huésped vertebrado y favorecen la transmisión a éste de los protozoarios que se desarrollan en sus glándulas salivales. Estas proteínas son características de cada especie de triatomino y pueden ayudar a diferenciar especies, incluso aquellas fenotípicamente similares. Objetivo: Describir los perfiles electroforéticos de las proteínas salivales de Triatoma dimidiata encontrados en el intradomicilio, peridomicilio y extradomicilio en un área endémica en Santander. Materiales y métodos: Se disectaron las glándulas salivales de insectos adultos de T. dimidiata de tres municipios de Santander procedentes de colonias de laboratorio y de campo. Los perfiles de proteínas se visualizaron realizando una electroforesis de una dimensión en geles de poliacrilamida tenidos con azul de Coomassie. Resultados: Los perfiles electroforéticos de las proteínas presentes en la saliva de T. dimidiata muestran hasta 33 bandas en el rango de 23,7 a 228,8 kDa, con una alta concentración en la región 41 a 99,7 kDa. El índice de polimorfismo para T. dimidiata fue de 0,9646. Conclusión: El perfil electroforético de las proteínas salivares de T. dimidiata mostró una composición proteica compleja, donde las bandas más prominentes tienen pesos moleculares menores de 45 KDa. No se pudieron establecer agrupamientos basados en las regiones geográficas y lugares de captura, a pesar de la gran variabilidad intraespecífica observada. Sin embargo, se pudieron establecer diferencias claras a nivel de especie entre T. dimidiata y el grupo externo utilizado, P. geniculatus. Salud UIS 2009; 41: 121-127. Introduction: The triatomines (Heteroptera, Reduviidae, Triatominae) are hematophagous insects that secrete saliva rich in proteins with anticoagulant, antihistamine, vasodilator and platelet inhibitor properties, these facilitate its alimentary process on the vertebrate host and facilitate transmission of the protozoa carried in the salivary glands of the triatomines. Such proteins are characteristic of each triatomine species and might help differentiate species, including those phenotypically similar. Objective: Describe electrophoretic profiles of salivary proteins of Triatoma dimidiata found inside, around and outside residences in an endemic area of Santander. Materials and methods: Salivary glands from adult insects of T. dimidi
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