Biologia do Triatoma nitida Usinger, 1939 em laboratório (Hemiptera: Reduviidae)

Abstract

Triatoma nitida is a wild species occurring in Mexico and Central America. In order to establish the length of its life cycle andtransmission potential, the following parameters were observed: the incubation period, the interval between hatching, or moulting, and the first feeding; the number of blood meals and the time of development. The time-lapse before the bite, the length of feeding and the interval between the end of the blood meal and defecation, as well as the site of defecation were also analyzed. Average length of the egg incubation period was 18.2 days. Time interval between the food source offering and the bite was less than 4 min in 60% of the analyzed cases, except in the fifth instar, where only 38% of the insects began feeding in less than 5 min. The blood-sucking period was long and rising until the fifth instar, decreasing in adults, and ranging from 1 min to 2 and a half hours. Only 26% of the blood meals were followed by defecations within 20 min. The average length of the life cycle was 897.5 days.

Biology of three species of North American Triatominae (Hemiptera: Reduviidae: Triatominae) fed on rabbits

“…Mean number of blood meals necessary for molting to the next instar was similar in all three species. It was also similar to some species values related to T. gerstaeckeri, such as Meccus longipennis (Usinger) in both cohorts (fed on hens or on white rats), Meccus pallidipennis (Stål) (fed on rabbits) and Triatoma barberi (Usinger) (fed on rabbits); however, it was smaller than the number of meals in Triatoma nitida (Usinger) (fed on pigeons); the two latter being related to T. lecticularia and T. protracta (Galvão et al 1995, 2005, Martínez-Ibarra & Novelo-López 2004.Mortality rates were lower in T. gerstaeckeri than in the other two species studied, as in the case of certain related species, such as T. dimidiata (fed on rabbits) and M. longipennis (Martínez-Ibarra et al 2001. On the other hand, mortality indexes for T. lecticularia and T. protracta were similar to that of larger Mexican species, such as M. picturatus (Usinger) (fed on rabbits or on hens) and M. bassolsae (fed on rabbits) (Martínez-Ibarra et al 2003b, 2006.…”

Feeding, defecation, and development times of Meccus longipennis Usinger, 1939 (Hemiptera: Reduviidae: Triatominae) under laboratory conditions

“…The average development time of the cohort of M. longipennis fed on hens (196.6 ± 15.8 days) was shorter than the average development time of some other Mexican Triatominae species, like the 897.5 days for T. nitida feeding weekly on mice and maintained at 28 ± 1 o C and 80 ± 5% rh (Galvão et al 1995), than the development time of 240 days (range 180-336 days) for T. dimidiata feeding fortnightly on rabbits and maintained at 26.5 ± 0.5 o C and 50 ± 5% rh (Zeledón et al 1970) and than the development time of 235.77 days for M. mazzottii feeding weekly on rabbits and maintained at 27 ± 2 o C and 70% rh (Malo et al 1993). The average development time in our study was similar to development times of 196.8 ± 15.8 and 189.5 ± 22.9 days for M. picturata feeding weekly on hens and rabbits, respectively, and maintained under similar laboratory conditions (Martínez-Ibarra et al 2003b).…”

Biology of Triatoma klugi Carcavallo, Jurberg, Lent & Galvão 2001 (Heteroptera: Reduviidae) under Laboratory Conditions: Effects of Distinct Blood Sources and Susceptibility to Trypanosoma cruzi and Trypanosoma rangeli

“…Moreover, the blood meal source also have influence on triatomine reproductive success, which was demonstrated when T. brasiliensis and T. sordida fed on mice presented a higher egg production when compared with insects fed on pigeons (Guarneri et al 2000). The efficacy of T. cruzi transmission to mammalian hosts is dependent on several factors such as the insect susceptibility to the parasite strain, the mean time between feeding and defecation of contaminated triatomine feces over the host skin as well as the number of blood meals taken in each life stage, allowing predictions of the triatomine vectorial capacity (Galvão et al 1995).…”