苜蓿夜蛾触角感器的扫描电镜观察

Scanning Electron Microscopy Observation on Antennal Sensilla of Heliothis viriplaca

[目的]为了明确苜蓿夜蛾雌雄成虫触角和感觉器的外部形态特点。[方法]利用电子扫描显微镜,对苜蓿夜蛾雌雄成虫触角的形态特征、感觉器的类型、形态和分布特点进行扫描电镜观察,并且对雌蜂、雄蜂触角感觉器进行性别间差异进行比较。[结果]苜蓿夜蛾触角类型属于线状触角,由柄节、梗节和鞭节组成。触角上着生有毛形感器(STⅠ和STⅡ型)、刺形感器、腔锥形感器(SCOⅠ和SCOⅡ型)、耳形感器、鳞形感器、栓锥形感器、锥形感器和Bhm氏鬃毛。其中,仅雌雄虫触角上的耳形感器形态有所差异。触角感器主要分布于触角鞭节的迎风面和侧面,以毛形感器数量最多,刺形感器排列较整齐和规律,鞭节背风面有半包围状整齐排列的鳞片,鳞片结合处有零星分布的磷形感器、刺形感器。柄节和梗节周围被鳞片包被并分布着Bhm氏鬃毛感器。通过对雌雄触角感器的测量,发现雌雄虫大部分感器大小存在显著差异。[结论]苜蓿夜蛾触角属于线状触角,共有8种类型感器。除耳形感器外,其他触角感器雌雄间形态一致,而且雄虫触角感器明显比雌虫触角感器发达。

[ Objeetive ] The research aimed to define external morphological characteristics of antennae and sensilla of Heliothis viriplaca. [ Method] Morphological characteristics of the antenna and the type, morphology and distributions of antenna sensilla of Heliothis viriplaca were examined and photographed with scanning electron microscope. The difference in sensilla between both sexes was also compared. [ Result ] The antennas of Heliothis viriplaca are filiform and composed of the scape, pedicel and flagellum. Eight types of antennal sensilla were indentifled, including two types of sensilla trichodea （ ST Ⅰ and ST Ⅱ ） , sensilla chaetica, sensiila basiconca, sensilla coeloeomica （ SCOⅠ and SCOⅡ ）, sensilla aurieillica, sensillum squamiformia, scnsilla styloconiea and Bohm＇ s bristles. Only sensilla auricillica was different between both sexes. The sensilla distributed the rear and side of antenna. Sensilla trichodea was the most sensillum, and sensilla chaetica was orderly on the antenna. Half of the flagellum was wrapped in order by squama, and a few of sensillum squamiformia and sensilla chaetica distributed in the squamas. The Boihm was distributed on scape and pedicel was wrapped by squama. The majority of sensilla had significant difference through the measurement of the antenna1 sensilla of male and female. [ Conclusion] The antennas of male and female adult Heliothis viriplaca are both filiform. Eight types of antennal sensilla were indenflfied in the antenna, and all types of sensilla are similar on morphological charac- teristics except sensilla auricillica between both sexes. The sensilla of male are significantly larger than female＇ s.