ABSTRACT

Females of many species of Trichoptera (caddisflies) use pheromones to attract males prior to mating. A diverse array of chemosensory sensilla present on the antennae of both males and females are likely to mediate communication between the sexes. Zelandopsyche ingens Tillyard is a large oeconesid caddisfly, which inhabits small forest streams in the South Island of New Zealand. At night, males of Z. ingens were found standing on the tops of large stones projecting from the stream bed and waving their antennae up and down. This behaviour is thought to be associated with the detection of chemosensory signals from con-specific females. Meanwhile, females occupied various substrata on the stream bank and within the channel. Bi-directional sticky traps placed immediately above the stream collected large numbers of low-flying males, particularly on their downstream sides suggesting many may have been moving upstream in response to pheromonal cues. Some captured females had laid eggs on the traps indicating they were undertaking oviposition flights. Sensilla on the antennae of both sexes were predominantly forward-directed long grooved trichoids overlying numerous short stellate pseudoplacoids of two morphological forms that have not been described before.

摘要

毛鳞翅目（鳞翅目）的许多雌性在交配前都使用信息素吸引雄性。男女触角上都存在着各种各样的化学感应传感器，它们可能介导两性之间的交流。Zelandopsyche ingens Tillyard是大型节肢动物，生活在新西兰南岛的小森林溪流中。到了晚上，Z。ingens的雄性他们被发现站在从河床伸出的大石头顶上，上下挥动触角。这种行为被认为与同种雌性的化学感应信号的检测有关。同时，雌性在河岸上和河道内占据了各种底层。紧邻溪流上方的双向粘性捕集阱收集了大量低速飞行的雄性，特别是在其下游侧，这表明许多人可能已经响应信息素线索向上游移动。一些被捕的雌性在陷阱上产卵，表明他们正在进行产卵飞行。男女触角上的Sensilla主要是前向性的长沟毛线虫，上面覆盖着许多之前未描述过的两种形态形态的短星状假拟卵状体。