Scanning electron microscope observations on the antennal sensilla of two stored grain pests Trogoderma granarium and Trogoderma variabile (Coleoptera: Dermestidae)
Keywords:
adaptation, sensilla chaetica, sensilla basiconica, sensilla coeloconica, Böhm bristles, scanning electron microscopy (SEM)Abstract
In this study both adult male and female antennal sensilla of Trogoderma granarium Everts, 1896 and Trogoderma variabile Ballion, 1878 (Coleoptera: Dermestidae) were observed by scanning electron microscope. The antennae of both species were found to consist of a scape, a pedicel and a flagellum with 9 subsegments, i.e., flagellomeres. Four categories of antennal sensilla including 10 types were found in these 2 species. The sensilla were designated, sensilla chaetica I, sensilla chaetica II, sensilla chaetica III, sensilla basiconica I, sensilla basiconica II, sensilla basiconica III, sensilla basiconica IV, sensilla basiconica V, sensilla coeloconica and Böhm bristles. The characteristics and distribution of these antennal sensilla were described, and relevant differences between the male and the female were compared. Finally, the probable functions and their applications in taxonomy were briefly discussed. These findings provide an improved understanding of the morphology of the antennae in these 2 species and can help to distinguish them clearly. Besides, these results also will support investigations into adaptions of these Trogoderma species to storage environments.
Resumen
En este estudio, se observaron por microscopía electrónica de barrido, las sensilas de las antenas de los machos y hembras de Trogoderma granarium Vuelca, 1896 y Trogoderma variabile Ballion, 1878 (Coleoptera: Dermestidae). Se encontró que las antenas de ambas especies consisten en un escapo, un pedicelo y un flagelo con 9 subsegmentos, los que se llaman flagelómeros. Se encontraron tres categorías, incluyendo 10 tipos de sensilas antenales en estas 2 especies. Las sensilas fueron designadas, Sensila queticas I, Sensila queticas II, Sensila queticas III, Sensila basiconica I, Sensila basiconica II, Sensila basiconica III, Sensila basiconica IV, Sensila basiconica V, Sensila basiconica VI, Sensila coeloconica y setas Böhm. Se describen las características y la distribución de estas sensilas antenales y se comparan las diferencias relevantes entre las del macho y la hembra. Por último, se discuten brevemente las funciones probables y sus aplicaciones en la taxonomía. Estos resultados aportan una mejor comprensión de la morfología de las antenas en estas 2 especies y su apoya en la investigación de las adaptaciones de estas especies Trogoderma a los ambientes de almacénaje.
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