Comparative study of the stridulatory sulcus, buccula and rostrum of the nymphs of Triatoma guazu Lent & Wygodzinsky, 1979 and Triatoma jurbergi Carcavallo, Galvão & Lent, 1998 by scanning electron microscopy (Hemiptera, Reduviidae)

Abstract

The ultrastructural morphology of the ventral region of the head (rostrum and buccula) and proesternum (stridulatory sulcus) of nymphs from the 1st to 5th instars of Triatoma guazu Wygodzinsky, 1979 and Triatoma jurbergi Carcavallo, Galvão & was described. Morphological differences between the two species and of the five nymphal stages development of each species were observed. These structures showed systematic differential characteristics of the studied species and may be used to increase their taxonomic range.

Morphobiological aspects of Rhodnius brethesi Matta, 1919 (Hemiptera:Reduviidae) from the Upper and Middle Negro River, Amazon region of Brazil: I - scanning electron microscopy

“…In the present study on R. brethesi, it was found to have the shape of an amphora. In this, it differs from what has been observed for other genera, and for other species of the same genus, as demonstrated by Lent and Wygodzinsky (1979) and Silva et al (2003).…”

“…In this, it differs from the species Triatoma williami and Triatoma gerstaeckeri (Ferro et al 1997) and also from Triatoma guazu and Triatoma jurbergi (Silva et al 2003), which have a U-shaped format.…”

“…There have also been reports of the presence of this species in Colombia and Venezuela (Carcavallo et al 1999. All these findings emphasize the importance of studies to promote greater knowledge of this species, and among these, studies of the ultrastructure of specimens coming from the Negro River.Morphological studies on triatomines, utilizing the resources of scanning electron microscopy, have been performed by several authors on different species and in relation to all stages of development (Lent & Wygodzinsky 1979, Barata 1981, Gonçalves et al 1985, Costa et al 1991, Galíndez Girón et al 1994, Silva et al 2003. These studies have made effective contributions towards the systematics of triatomines, through elucidation of the status of cryptic species and their complexes.…”

“…Structures like the stridulatory sulcus, buccula and rostrum were highlighted by Carcavallo et al (1996), Silva et al (2003), Ferro et al (1997Ferro et al ( , 1998, Andrade et al (2002), and Silva et al (2003) as having taxonomic importance in aiding in differentiating between populations existing within the same areas.…”

Comparative study of the stridulatorium sulcus, buccula and rostrum of nymphs of Triatoma klugi Carcavallo et al, Triatoma vandae Carcavallo et al and Triatoma williami Galvão et al (Hemiptera: Reduviidae)

“…In the present study this structure was useful to distinguish T. williami and T. klugi, from T. vandae. Silva (1999Silva ( , 2000 and Silva et al (2003) analysed the buccula of T. guazu and T. jubergi at all nymphal stages and concluded that this structure differed between both species, being suggested as an additional taxonomic trait. Catalá (1996) described ten sensillae on the rostrum of eight species of Triatomine and concluded that the chaetigerous sensillae is more abundant in the rostrum in six lines along the main axe of the 2 nd and 3 rd segments.…”