Morphological study of eggs from five Mexican species and two morphotypes in the genus<i>Triatoma</i>(Laporte, 1832)

Rivas, Nancy; Sánchez, Ma. Esther; Martínez-Ibarra, Alejandro; Camacho, Alejandro D.; Tovar-Soto, Alejandro; Alejandre‐Aguilar, Ricardo

doi:10.1111/j.1948-7134.2013.12013.x

Cited by 8 publications

(7 citation statements)

References 17 publications

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“…However, in both cases, there are five‐ to seven‐sided polygons with a predominance of hexagons. The morphology of the chorion of T. recurva is similar to that of some of the species described for Mexico, but it is clearly different from those of the rest of the Triatoma species described for this country (Villalobos et al , Rivas et al ).…”

Section: Discussionmentioning

confidence: 59%

Comparative egg morphology of six Meccus species and Triatoma recurva (Stål, 1868) Hemiptera: Reduviidae

Rivas¹,

Sánchez-Espíndola

Camacho³

et al. 2016

Journal of Vector Ecology

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We investigated the morphology and morphometry of eggs from the colonies of the Entomology Laboratory at ENCB-IPN belonging to six species of the genus Meccus and Triatoma recurva, using both light and scanning electron microscopy. Egg ornamentation is an important parameter to consider in the differentiation of species. Samples were observed under a scanning electron microscope. Measurements of fifty eggs per species included length, width, and opercular diameter, which were used for the morphometric analysis. The results showed that the seven species display a polygonal ornamentation dominated by hexagons; the operculum shows also a polygonal ornamental characteristic in each species. Morphometry provided valuable information for discriminating between closely related species of the genus Meccus and Triatoma recurva, a species akin to this group, thereby facilitating the complete discrimination of these species. Journal of Vector Ecology 41 (1): 135-141. 2016.

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Section: Discussionmentioning

confidence: 59%

Comparative egg morphology of six Meccus species and Triatoma recurva (Stål, 1868) Hemiptera: Reduviidae

Rivas¹,

Sánchez-Espíndola

Camacho³

et al. 2016

Journal of Vector Ecology

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“…Morphological and morphometric analyses conducted with other structures, such as the scutellum, genital plates in nymphs, and egg ornamentation, have shown no polymorphism in several Meccus species. At the same time, these studies have provided discriminant characters to differentiate among species (Rodríguez‐Sánchez et al , Takashi et al , Rivas et al , ).…”

Section: Discussionmentioning

confidence: 99%

External female genitalia of six species of the genusMeccus(Hemiptera: Reduviidae: Triatominae)

Rivas

Sánchez‐Cordero

Camacho

et al. 2017

Journal of Vector Ecology

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Triatomine classification is based on morphological characteristics. Studies have been conducted to improve their identification by observing many characteristics. However, there are problems of differentiating among highly interrelated species and new criteria are required. The purpose of this study was to determine the morphological differences in the external female genitalia of M. pallidipennis, M. longipennis, M. picturatus, M. bassolsae, M. mazzottii, and M. phyllosomus in order to distinguish among species using scanning electron microscopy. Observations were made of the dorsal, posterior, lateral, and ventral views of the female external genitalia for each species. In the six species we studied, relevant differences were observed in the dorsal view of the X segment, as well as the IX, VIII, and VII tergites. In the posterior and lateral view, the most visible differences were registered in the gonocoxite size of the segments VIII, IX, and X. Finally, in the ventral view of the VII sternite, differences among species were observed in the size of the inflection in the top and upper corner. Our results show that it was possible to differentiate among the triatominae species for each of the four views by using a scanning electron microscope to analyze morphological characteristics of the VII, VIII, IX, and X abdomen segments. Journal of Vector Ecology 42 (2): 271-278. 2017.

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“…Systematic studies on the Triatominae were mainly focused on adults and nymphs, and less frequently on eggs [ 13 ]. For species [ 14 – 22 ], or population characterization [ 23 – 25 ], egg morphology has been examined mainly on the basis of qualitative characters such as color pattern and structural characteristic (form, texture of shell and operculum, exochorial architecture).…”

Section: Introductionmentioning

confidence: 99%

“…Except for a recent study comparing the chorial rim and the collar of the eggs between various species of Rhodnius [ 19 ], the morphometric studies always relied on traditional techniques [ 13 , 15 , 18 , 20 , 22 – 27 ]. The main problem for the study of elliptical structures (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Frequently, the morphology of the eggs of Triatominae considers separately the operculum and the remaining part of the egg [ 17 , 22 , 29 ]. We thus separated the morphometric analysis of the operculum, performed according to the landmark-based method, and the analysis considering the complete egg (including the operculum), based on the outline-based morphometric approach.…”

Section: Introductionmentioning

confidence: 99%

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The modern morphometric approach to identify eggs of Triatominae

et al. 2017

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BackgroundEgg morphometrics in the Triatominae has proved to be informative for distinguishing tribes or genera, and has been based generally on traditional morphometrics. However, more resolution is required, allowing species or even population recognition, because the presence of eggs in the domicile could be related to the species ability to colonize human dwellings, suggesting its importance as a vector.ResultsWe explored the resolution of modern morphometric methods to distinguish not only tribes and genera, but also species or geographic populations in some important Triatominae. Four species were considered, representing two tribes and three genera: Panstrongylus chinai and P. howardi, Triatoma carrioni and Rhodnius ecuadoriensis. Within R. ecuadoriensis, two geographical populations of Ecuador were compared. For these comparisons, we selected the most suitable day of egg development, as well as the possible best position of the egg for data capture. The shape of the eggs in the Triatominae does not offer true anatomical landmarks as the ones used in landmark-based morphometrics, except for the egg cap, especially in eggs with an evident “neck”, such as those of the Rhodniini. To capture the operculum shape variation, we used the landmark- and semilandmark-based method. The results obtained from the metric properties of the operculum were compared with the ones provided by the simple contour of the whole egg, as analyzed by the Elliptic Fourier Analysis. Clear differences could be disclosed between the genera, between the species - among which two very close species (P. chinai and P. howardi), as well as between two allopatric, conspecific populations. The whole egg contour (including the operculum) produced reclassification scores much more satisfactory than the ones obtained using the operculum only.ConclusionsWe propose the outline-based approach as the most convenient characterization tool to identify unknown eggs at the species or population levels.Electronic supplementary materialThe online version of this article (doi:10.1186/s13071-017-1982-2) contains supplementary material, which is available to authorized users.

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Morphological study of eggs from five Mexican species and two morphotypes in the genusTriatoma(Laporte, 1832)

Cited by 8 publications

References 17 publications

Comparative egg morphology of six Meccus species and Triatoma recurva (Stål, 1868) Hemiptera: Reduviidae

Comparative egg morphology of six Meccus species and Triatoma recurva (Stål, 1868) Hemiptera: Reduviidae

External female genitalia of six species of the genusMeccus(Hemiptera: Reduviidae: Triatominae)

The modern morphometric approach to identify eggs of Triatominae

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