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• W565580002 abstract "-The total number and distribution per antennal flagellomere of sensilla placodea (olfactory disks), sensilla coeloconica, sensilla ampullacea and sensilla campaniformia were determined in workers of Nannotrigona testaceicornis Lepeletier a stingless bee species quite common in Brazil. The distribution of the sensilla was uniform, with the largest number oc curring in flagellomere 10 and gradually decreasing in the direction of the basal flagellomeres in a way similar to that observed in Scaptotrigona postica Latreille. Nannotrigona testaceicornis had a larger number of sensilla ampullacea and a smaller number of sensilla coeloconica and sensilla campaniformia than Scaptotrigona postica. Although Nan notrigona testaceicornis does not communicate through the formation of pheromone trails, this species presents a larger quantity of sensilla placodea (relative to the length of the flagellum) than Scaptotrigona postica. Nannotrigona testaceicornis, a stingless bee species quite common in Brazil, is found from the north of Parana up to Mexico (Nogueira Neto, 1970). This species presents on average populous colonies, generally consisting of 2,000 to 3,000 indi viduals (Lindauer and Kerr, 1960). Nannotrigona testaceicornis has been studied from different aspects such as ovi position behavior (Sakagami and Zucchi, 1966), communication (Kerr and Esch, 1965), glandular system (Cruz-Landim, 1967), taxonomy (Moure, 1951), nest struc ture (Nogueira Neto, 1970) and morphometry (Cunha, 1973). On the other hand, only little information exists with respect to the antennal sensilla placodea of the workers of this species (Johnson and Howard, 1987). In order to expand the knowledge about the outer morphology of Brazilian sting less bees, we determined the number and distribution of sensilla placodea, sensilla coeloconica, sensilla ampullacea and sensilla campaniformia of the antennae of Nan notrigona testaceicornis workers. MATERIAL AND METHODS Samples of Nannotrigona testaceicornis Lepeletier workers were collected from colonies maintained at the Animal House of the Biosciences Institute of Rio Claro. The bees were anesthetized and killed in an ether chamber, fixed in modified Kar novsky (2% glutaraldehyde and 2% paraformaldehyde in 0.1 M phosphate buffer, pH 7.2) for 24 hours and stored in 70% alcohol. The antennae were separated from ' Research supported by CNPq and FAPESP. This content downloaded from 207.46.13.101 on Sat, 08 Oct 2016 06:01:05 UTC All use subject to http://about.jstor.org/terms 1997 ANTENNAE OF NANNOTRIGONA TESTACEICORNIS 231 the head, treated with ultrasound for 1 minute to remove dirt particles and glued to a metal support. The antennae were then sputtered with a thin gold layer using an Edwards Sputter apparatus, model S150B, and observed with a model T330A Jeol scanning electron mi croscope of the Chemistry Institute, UNESP, Araraquara. For sensilla placodea (olfactory disks) counts, the antennal flagellomeres were separated and opened with the aid of two entomology pins and mounted on balsam between a slide and a coverslip. Each flagellomere was photographed with a Zeiss photomicroscope II, and the film was projected onto a paper screen where the sen sory structures were counted. The ratio number of sensilla placodea to length of the flagellum was also studied. The length of the flagellum was measured under a dissecting microscope equipped with an optical micrometer. Ten worker bees were used for the observations and counts." @default.
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• W565580002 date "1998-06-01" @default.
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• W565580002 title "Sensory structures of the antennae of Nannotrigona testaceicornis (Apidae : Meliponinae)" @default.
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