Morphology and distribution of antennal sensilla of Gryon gallardoi (Brèthes) (Hymenoptera: Scelionidae) females

Abstract

Neotropical Entomology 36(5): 721-728 (2007) Morfologia e Distribuição das Sensilas Antenais das Fêmeas de Gryon gallardoi (Brèthes) (Hymenoptera: Scelionidae)RESUMO -Usando a microscopia eletrônica de varredura, foram descritas e ilustradas a morfologia externa e a distribuição das sensilas antenais da fêmea de Gryon gallardoi (Bréthes), um importante parasitóide de ovos de coreídeos. As antenas são genículo-clavadas, dotadas de 12 antenômeros. Ao dois tamanhos -uma mais alongada e outra mais curta, estilocônicas, cavilhas, falciformes e tricóides, em associação ao comportamento de tamborilamento antenal de G. gallardoi são discutidos Assim, a descrição e a determinação do padrão de distribuição das sensilas antenais de G. gallardoi, no presente estudo, é um avanço no sentido de elucidar os mecanismos envolvidos nos comportamento de seleção de hospedeiros dessa espécie.PALAVRAS-CHAVE: Ultraestrutura, seleção de hospedeiros, parasitóide de ovos ABSTRACT -With the aid of scanning electron microscopy, the external morphology and distribution of the antennal sensilla were described for females of Gryon gallardoi (Bréthes), an egg-parasitoid of coreids. The we registered dorsal glands and seven types of sensilla: papillary, chaetica of two sizes -long and short types, styloconic grooved-peg, sickle-shaped and trichodea with numerical and spatial variation G. gallardoi antennal drumming behavior. Thus, the determination and the description pattern of antennal sensilla in G. gallardoi, in the present study, is an advance regarding the elucidation of the mechanisms involved in the host selection behavior of this species.

Diverse Filters to Sense: Great Variability of Antennal Morphology and Sensillar Equipment in Gall-Wasps (Hymenoptera: Cynipidae)

“…In Platygastroidea, SP of the above-described shape seem to be absent. Instead, one type of multiporous sensilla, the papillary sensilla [73], could be homologous to SP, as previously also suggested by Bin [84], Barlin & Vinson [85], Basibuyuk & Quicke [51] and, Zacharuck [86] which called such sensilla as “plates” or “multiporous plates”. The very typical shape of papillary sensilla in Platygastroidea include their relatively small size (resembling the relative size of SP found in Aculeata, e.g.…”

“…For example, geniculate and clavate antennae (i.e. bent or hinged sharply, almost like a knee or elbow joint, with an apical clava or club) can be found in the majority of Chalcidoidea and in Platygastroidea [22], [70]–[73], while in Ichneumonoidea, the antennae are more often filiform (often of the moniliform sub-type) [74], [75]. It seems, thus, that Cynipoidea have overall antennae with a general shape more similar to Ichneumonoidea than the rest of Proctotrupomorpha.…”

“…In the other Proctotrupomorpha studied to date, the number of sensilla types ranged from 4 to 14 per species [11], [22], [70]–[73], [80], and 4–11 types per species were described in Ichneumonoidea [26], [74], [75]. A comparison of the morphology of these sensillar types among lineages is presented below, together with hypotheses on their function as suggested by histological studies performed on some species.…”

“…As a matter of fact, they seem to be associated with tasting, being also named “multiporous gustatory sensilla” [21]. Another sensillar type very peculiar in Platygastroidea is the “sensillum trichodeum curvatum” or “horn- and sickle-like sensilla” [73], [80]. These are large, multi-porous, sharply bent anteriorly just above the base and are acutely pointed at the tip, and resemble the SP in Chalcidoidea and in Acanthaegilips sp., with the exception that these sensilla are not embedded in the antenna as in the SP.…”

Morphological and morphometric studies of the antennal sensilla from two populations of Atta robusta (Borgmeier 1939) (Hymenoptera: Formicidae)

“…There are also several different types of sensilla, which are classified according to their shape and size. Generally speaking, the most common types of sensilla of hymenopterans are trichoid and basiconic, which are involved with mechanical and chemical perception (Renthal et al, 2003;Ozaki et al, 2005;Rocha et al, 2007;Spaethe et al, 2007;Onagbola et al, 2008).…”