双委夜蛾触角感器的扫描电镜观察

本研究采用扫描电子显微技术,对双委夜蛾Athetis dissimilis成虫触角及感器类型进行详细观察。结果表明:双委夜蛾雌雄成虫触角感器类型和特征差异不显著,二者均为丝状,分布有8种类型的感器,分别为毛形感器、刺形感器、锥形感器、栓锥形感器、腔锥形感器、鳞形感器、耳形感器和B9hm氏鬃毛。其中6种类型的感器(毛形感器、刺形感器、锥形感器、栓锥形感器、腔锥形感器、耳形感器)表面具有单孔和多孔,表明它们的主要功能是嗅觉。锥形感器和栓锥形感器又分为不同的亚型,锥形感器分为两个亚型(SbaⅠ和Ⅱ),栓锥形感器分为三个亚型(SstⅠ,Ⅱ和Ⅲ)。栓锥形感器Ⅰ和Ⅱ在数量上较少。在雌雄蛾触角上毛形感器数量最多,而且雄蛾毛形感器数量明显多于而且长于雌蛾。     

Ultrastructure of antennal sensilla of an autoparasitoid Encarsia sophia (Hymenoptera: Aphelinidae)

Encarsia sophia (Hymenoptera: Aphelinidae) is a parasitoid utilized for biological control of Bemisia tabaci, with selection of prey aided by chemoreceptor organs. The morphology and distribution of the antennal sensilla (chemoreceptors) of E. sophia were examined using Transmission electron micrographs. The total antennal length for E. sophia was 429.28 ± 0.95 μm for females and 437.19 ± 8.21 for males, and each antennae was found to consist of seven sensilla of different types. Both sexes possessed sensilla chaetica, sensilla trichodea, basiconic capitate peg sensilla, multiporous grooved-surface placoid sensilla (MG-PS), uniporous rod-like sensilla, nonporous finger-like sensilla, and sensilla coeloconica. Transmission electron micrographs of longitudinal sections of female antennae showed that they were composed of fat body, cuticle, mesoscutello-metanotal muscles, neurons, and glandular tissue, and cross-sections of the basal MG-PS showed sensillar lymph cavities and dendrites. The MG-PSs were imbedded in an electron-dense mass with cuticular invaginations which acted as pores that connected to a central lumen. The possible function of each type of sensilla is discussed.     

Antennal sensilla of some forensically important flies in families Calliphoridae, Sarcophagidae and Muscidae

Antennal sensilla of some forensically important fly species in the families Calliphoridae (Chrysomya megacephala, Chrysomya rufifacies, Chrysomya nigripes and Lucilia cuprina), Sarcophagidae (Parasarcophaga dux) and Muscidae (Musca domestica) were studied using scanning electron microscopy. Five types of sensilla were observed: trichoid, basiconic, coeloconic, styloconic and sensory pit. Only trichoid sensilla are found on the scape of the antenna, while both trichoid and styloconic sensilla are located on the antennal pedicels of all species studied. Basiconic sensilla are the most numerous of the sensilla found on the antennae of both sexes of all fly species studied and are comprised of two subtypes: large and small basiconic sensilla. Coeloconic sensilla are characterized by short pegs, with either grooved or smooth surfaces, that are sunken into deep depressions. No marked difference was observed in the number, morphological structure or distributional pattern of any of the sensilla among the species studied, with the exception of there being more numerous sensory pits detected in female P. dux compared to the other species. The suggested function of each antennal sensillum was based on comparison with results of other investigations on similar sensilla.