Ultrastructure of sensory receptors on the antennae of Scolytus multistriatus (Marsh.)

Comparative Study of the Antennae of Dendroctonus rhizophagus and Dendroctonus valens (Curculionidae: Scolytinae): Sensilla Types, Distribution and Club Shape

“…For example, the ST 1 identiÞed in this study for both species appears to be the same as that described for D. valens by Chen et al (2010), but is apparently equivalent to sensilla ST 2 recognized in other Dendroctonus species (Payne et al 1973), trichodea type II from Typodendrum lineatum (Moeck 1968), sensilla trichodea from Scolytus multistratus (Borg and Norris 1971), single-walled sensilla type II from Ips typographus (Hallberg 1982), and trichodea type I from Tomicus species (Wang et al 2012). In the same sense, the ST 2 described here for both species corresponds to that previously documented in D. valens (Chen et al 2010), whereas it resembles ST 3 of other Dendroctonus species (Payne et al 1973) .…”

“…The presence of an apical pore and a slightly rough wall in ST 1 of both species might suggest a chemoreceptor or gustatory function, as has been documented in other insect species (Zacharuk 1985, Gao et al 2006, Yang et al 2009). In addition, the morphological features of the sensilla ST 1 , ST 2 , and ST 3 (see Table 2) of these bark beetles suggest chemoreceptor and perhaps also mechanoreceptor functions, as has been reported for sensilla ST 2 and ST 3 of D. frontalis (Dickens and Payne 1977) and other scolytines (Borden 1968, Borg and Norris 1971, Wang et al 2012). Further, single-cell recording studies (Payne et al 1973, Hallberg et al 1994 have demonstrated that these sensilla respond to different exogenous compounds including pheromones.…”

“…Morphological differences in species of Dendroctonus have been observed between the sensilla chaetica of the scape and funicle and those found within and between the sensory bands of the club (Payne et al 1973). Based on electrophysiological and anatomical data, several authors agree that these sensilla in bark beetles likely have a mechanoreceptor function associated with exploration of the environment through contact with the substrate (Borden and Wood 1966, Borden 1968, Moeck 1968, Borg and Norris 1971, Payne et al 1973, Dickens and Payne 1978, Wang et al 2012. Both mechanosensory and gustatory functions have been attributed to sensilla chaetica in other beetles species within Curculionidae (Bland 1981, Alm and Hall 1986, Isidoro and Solinas 1992, Coccinellidae (Jourdan et al 1995), Tenebrionidae (Harbach and Larson 1977) and Chrysomelidae (Isidoro et al 1998, Bartlet et al 1999.…”

“…The sensilla chaetica in both species occurred predominantly in the antennal scape and funicle, but in other bark and ambrosia beetles, such as Dendroctonus terebrans (Olivier) and Dendroctonus ponderosae, these sensilla were found on all segments of the antenna (Borden and Wood 1966, Moeck 1968, Borg and Norris 1971, Payne et al 1973, Wang et al 2012). Morphological differences in species of Dendroctonus have been observed between the sensilla chaetica of the scape and funicle and those found within and between the sensory bands of the club (Payne et al 1973).…”

“…The antennae were brushed with a paintbrush to remove foreign matter before their observation under ESEM (model Evo 40 VP,Carl Zeiss,Oberkochen,Germany). Past studies on the morphological and ultrastructural organization of bark beetle antennae have identiÞed four types of sensilla: chaetica, trichodea, ßuted (grooved), and basiconica, which have been associated with mechano-, chemo-, or thermoreceptor functions (Borden and Wood 1966;Borden 1968;Moeck 1968;Borg and Norris 1971;Payne et al 1973;Dickens and Payne 1977;Whitehead 1981;Hallberg 1982;Dickens et al 1985;Faucheux 1989Faucheux , 1994Chen et al 2010;Wang et al 2012). For this study, sensilla were classiÞed based on their length and morphological features following Schneider (1964).…”