SEXUAL DIMORPHISM IN THE ARISTAE OF CERATITIS CAPITATA (DIPTERA, TEPHRITIDAE) AND ITS POSSIBLE IMPORTANCE IN COURTSHIP
ABSTRACT Los machos de Ceratitis capitata criados en laboratorio tuvieron aristas más largas en promedio y en proporción al tamaño del cuerpo que las de las hembras. Las aristas de machos y hembras tenían pelos de base fija sin membrana (microtrichiae); las aristas de las hembras eran cubiertas con más pelos distribuidos de forma más homogénea que en los machos. Las aristas de las hembras además tenían más curvas en el extremo distal. Las hembras con aristas cortadas experimentalmente fueron menos montadas, y menos copuladas una vez que eran montadas, que las hembras control. Se concluye que posiblemente los estímulos detectados por sus aristas afectan la disposición de la hembra a copular.
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ABSTRACT: The antennal sensilla of Anastrepha serpentina (Wiedemann) (Diptera: Tephritidae) adults were studied by means of scanning electron microscopy. Both sexes have the same form and number of antennal segments. The scape and the pedicel are covered entirely by microtrichia. In the distal part of both segments, a series of longitudinally striated hairs was observed, originating in a flexible socket and ending in a pointed tip. Six types of sensilla were observed in the funiculus: 1) thick-walled multiporous pitted sensilla subtype I and subtype II, 2) thin-walled multiporous pitted sensilla long subtype I and medium length subtype II, 3) basiconic sensilla, 4) multiporous grooved sensilla, 5) clavate sensilla, and 6) an olfactory pit with two small conical and striated sensilla inside. Furthermore, there is a large quantity of microtrichia surrounding the entire funiculus. In the proximal dorso-lateral region of the funiculus, there are trichoid aristae composed of two short segments and one large segment, which have fixed base bristles or tactile hairs without membranes.Annals of the Entomological Society of America 03/2009; · 1.20 Impact Factor
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ABSTRACT: The olive fruit fly, Bactrocera oleae (Diptera: Tephritidae), is a worldwide pest of olive fruits. To date, the mating behavior of this tephritid has not been fully clarified. Little has been reported regarding the characteristics and behavioral role of B. oleae male wing vibration. This study provides a detailed description of male wing vibration, recorded by a high-speed video camera and compared with a frame-by-frame analysis, prior to successful and unsuccessful matings. Experimental evidence is given of the importance of male wing vibration during courtship for successful mating. Firstly, when the males did not perform wing vibration, but simply jumped onto the female and immediately attempted to copulate, no successful matings were registered. Secondly, when the male’s wings were removed, the probability of successful mating was significantly reduced. Thirdly, the frequency and pulse duration of the male wing vibration during courtship were higher in successful matings than in unsuccessful ones. Lastly, a wing sexual dimorphism was found: length and total wing area were significantly higher among males. Overall, our research increases the knowledge of the reproductive behavior of B. oleae, by suggesting the importance of wing vibration among the range of sensory modalities used by this tephritid in sexual communication.Journal of Insect Behavior 01/2012; 25(6):590-603. · 0.90 Impact Factor
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ABSTRACT: Fruit flies (Diptera: Tephritidae) are important pests of many fruits and vegetables. In this study, the external morphology, types, and distribution of antennal sensilla in both male and female adults of the six fruit fly species, including Bactrocera tau (Walker), Bactrocera dorsalis (Hendel), Bactrocera cucurbitae (Coquillett), Bactrocera minax (Enderlein), Bactrocera diaphora (Hendel), and Bactrocera scutellata (Hendel), were observed by using scanning electron microscopy. The antennae of the six fruit fly species consist of a basal scape, pedicel, and an elongated flagellum. Arising from the proximal dorsal ridge of flagellum there is an arista consisting of two short basal segments and a long thin distal segment. Six distinct morphological types of sensilla are recorded in both sexes, including microtrichial sensilla, sensilla chaetica, sensilla trichoid, sensilla basiconica, short type of sensilla basiconica, and sensilla coeloconica. The abundance and distribution of these six sensilla types on the antennae of both sexes are recorded. In addition, the possible functions of the above-mentioned sensilla types are discussed in light of previously published literature. The functions include the mechanoreception of microtrichial sensilla, sensilla chaetica, and sensilla trichoid; olfactory functions of sensilla basiconic, and sensilla coeloconica; and thermoreception of the short type of sensilla basiconica. Future functional antennal morphology and electrophysiological studies are needed to confirm these proposed functions.Annals of the Entomological Society of America 06/2010; · 1.20 Impact Factor