Morphological Studies on the Triatoma brasiliensis Neiva, 1911 (Hemiptera, Reduviidae, Triatominae) Genital Structures and Eggs of Different Chromatic Forms

Phylogeny of Triatoma sherlocki (Hemiptera: Reduviidae: Triatominae) Inferred from Two Mitochondrial Genes Suggests Its Location Within the Triatoma brasiliensis Complex

“…15 This characteristic led this "species" to be subjected to a multi-disciplinary study of its morphology, biology, ecology, isoenzymes, and mitochondrial DNA variation. 14,[16][17][18][19][20] It was concluded that T. brasiliensis is in fact a complex of species based on three allopatric evolutionary units: T. brasiliensis Neiva, 1911, T. brasiliensis melanica Neiva and Lent, 1941 and T. brasiliensis macromelasoma Galvão, 1956. 15 Molecular markers based on DNA have led to considerable progress in the understanding of genetic relatedness, phylogeny, and population dynamics in triatomines during the last 10 years.…”

Ecologic niche modeling and differentiation of populations of Triatoma brasiliensis neiva, 1911, the most important Chagas' disease vector in northeastern Brazil (hemiptera, reduviidae, triatominae).

“…This point has already been emphasized: Populations, even when reared with the same environmental conditions and food sources, maintained their original color patterns. 6 Hence, the case against ecotypic variations producing the different T. brasiliensis population phenotypes is supported.…”

“…For this study, all municipalities in which T. brasiliensis was collected inside domiciles were considered, for a total of 111 unique locality samples. The four different T. brasiliensis populations were characterized according to their geographic distribution 5 and coloration patterns; 6,23 in all, sample sizes for the four populations were 43 for brasiliensis, 7 for melanica, 14 for juazeiro, and 4 for macromelasoma. Distributional points for T. brasiliensis sensu lato for which specimens have not been checked by one of the authors (JC) and identified as to morphotype were excluded from specific analyses and are depicted on maps with question marks.…”

“…These differences are also reflected in morphologic, ecologic, biologic, and genetic variation. [5][6][7][8] Nevertheless, considerable debate exists regarding the nature of these differences: Do the various T. brasiliensis populations simply represent morphs of one broadly distributed species, or do they represent distinct biologic entities that could have distinct roles in ecologic communities and in disease transmission cycles?…”

Morphological study of the eggs and nymphs of Triatoma dimidiata (Latreille, 1811) observed by light and scanning electron microscopy (Hemiptera: Reduviidae: Triatominae)

“…Lizaraso (1957) concluded that populations of the same species, when provided with different laboratory and natural environments, could produce variations that affected the dimensions of the eggs without affecting the characteristics of the chorion, which remained constant. Morphometric studies of 33 Triatoma species were published (Galliard 1935b, Lizaraso 1957, Gonçalves et al 1985, Haridass 1986, Jurberg et al 1986, 1998, Jurberg & Vogel 1994, Jurberg & Campos 1995, Rosa 1995, Rocha et al 1996, Costa et al 1997, Silva et al 2000, Visciarelli et al 2004, Obara et al 2007a). According to Barata (1998), Triatoma possesses the following means: length, 2.05 ± 0.08 and diameter, 1.14 ± 0.05.…”