Arreglo de los polígonos del exocorion de huevos eclosionados de algunas especies de los géneros Triatoma Laporte, Meccus Stal y Nesotriatoma Usinger (Heteroptera: Reduviidae).

Abstract

Resumen. En este trabajo se estudiaron estructural y cuantitativamente las celdas exocoriales de huevos eclosionados de Triatoma infestans (Klug), Triatoma lenti Sherlock & Serafim, Triatoma maculata (Erichson), Triatoma sordida (Stal), Meccus picturatus (Usinger), Meccus longipennis (Usinger), Meccus pallidipennis (Stal) y Nesotriatoma flavida (Neiva). Los huevos se analizaron por regiones: caudal, media y cefálica. Se encontró que el hexágono fue el polígono más abundante en todas las regiones del huevo y en todas las especies, seguido del pentágono y del heptágono; se encontraron diferencias estadísticamente significativas en el número tanto de hexágonos y pentágonos entre regiones de una misma especie y entre la misma región de las diferentes especies, sin embargo, el número promedio de heptágonos no varió al comparar la región media entre las diferentes especies y al comparar las diferentes regiones en una misma especie. No se encontraron diferencias estadísticamente significativas en el promedio de polígonos, segmentos totales, heptágonos, hexágonos y pentágonos, al comparar las especies examinadas del género Meccus. Se propone un protocolo de identificación y análisis de teselaciones, con el cual se encontró que en 108 campos examinados de 385.000 µm 2 cada uno, se identificaron teselaciones compartidas en los 108 campos observados con determinadas combinaciones de heptágonos, hexágonos y pentágonos, y se observaron teselaciones no compartidas en la totalidad de los campos, con combinaciones de polígonos de cuatro a nueve lados, y cada teselación se representó por un grafo. Se discuten las implicaciones taxonómicas, funcionales, filogenéticas y construccionales de los arreglos poligonales descritos. Stal) and Nesotriatoma flavida (Neiva) was performed; cephalic, median and caudal egg regions were compared. It was found that cells with hexagonal shape were more abundant among all egg regions and studied species, followed by pentagonal and heptagonal polygons respectively. The average number of hexagonal and pentagonal polygons was significantly different among the three egg regions for each species, and when comparing the median, cephalic and caudal egg regions among different species. However, the average number of heptagons did not differ among the three egg regions for each species. The average number of heptagons did not differ when comparing the median egg region, but differed when comparing the cephalic and caudal egg regions, among different species. The average number of hexagons, pentagons, heptagons, total polygons, and total segments did not differ among the different species eggs of Meccus genus. A group of 108 micrographies (380,000 μm 2 each one) were studied using tessellation methods. Shared tilings and unshared tilings were found in all the micrographies observed. Shared tilings were conformed by combinations of heptagons, hexagons and pentagons, and unshared tilings by combinations of polygons from four to nine sides. Finally, each tiling arrangement was represented as a graph. Taxonomi...

Species-specific differences in the egg exochorium of the sympatric taxa Triatoma costalimai and Triatoma jatai (Hemiptera: Reduviidae: Triatominae)

“…The taxonomic value of morphological characteristics related to the exochorial structure of eggs for the differentiation of triatomines, as observed in the present study, has been demonstrated since the 1930s, based on the study of the egg exochorium from specimens of the genera Rhodnius and Triatoma ( Galliard 1935 ). Similarly, morphological (using OM or SEM) and morphometric approaches have been conducted for the characterization and taxonomic differentiation of other species of the genus Triatoma that occur in the Cerrado Biome, including T. brasiliensis ( Costa et al 1997 ), Triatoma sordida (Stål, 1859) ( González et al 2009 ), T. pseudomaculata ( Gonçalves et al 1985 ), T. williami ( Silva et al 2005 , Obara et al 2007 ), and T. costalimai ( Obara et al 2007 ).…”

Arthur Schopenhauer and the Current Conception of the Origin of Species: What Did the Philosopher Anticipate?

“…As a specific example, one of us (E.A.) showed that in Chagas disease vector (insects from the Triatominae subfamily), egg morphology design and variability are strongly controlled by architectural rules and mechanisms of nutrient interchange (Aldana, Arriechi, & Lizano, 2013;Aldana, Avendaño-Rangel, Lizano, Rodríguez-Bonfante, & Bonfante-Cabarcas, 2011;González, Aldana, Lizano, & López, 2009;Páez-Colasante & Aldana, 2008;Sandoval, Nieves, Angulo, Rosa, & Aldana, 2011). Hence, orthogenetic and constructional morphology principles may be the main mechanisms involved in egg design.…”

Evolution of hematophagous habit in Triatominae (Heteroptera: Reduviidae)

“…In other words, given that the phenotypical expression is not limited only by restrictions on their functioning but also by the way they were made (physical restraints) and by their past (historical and phylogenetic limits), it must be supposed that the driven force could be as much historicalgenetic as environmental (sensu De Renzi 2009;Dusenbery 2001; Figure 1). The theory of functional morphology or biomorphodynamics has advanced considerably towards this neo-evolutionary line of thinking (De Renzi 2009) and has allowed us to understand better the triatomines' evolution (e.g., González et al 2009). This review will offer a sketch of the phylogeny and radiation of the group and will show how these insects could have overcome, and even taken advantage of, several physical and ancestral barriers to adapt to bloodsucking of a nidicolous host.…”