The Key Laboratory of Forest Protection, State Forestry Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China.
Microsc Res Tech. 2010 May;73(5):560-71. doi: 10.1002/jemt.20795.
To investigate the host-finding mechanisms of Spathius agrili Yang, a parasitoid of the emerald ash borer, Agrilus planipennis Fairmaire, a highly concealed insect pest of Fraxinus spp. The morphology and ultrastructure of sensilla on the antennae and legs of both sexes and on the ovipositors and ovipositor sheaths of females were observed using SEM. Results showed that abundant sensilla trichodea (ST) are distributed on the antennae of both females and males, with the sharp trichoid with a socket at the base being the most numerous sensillum. There are 6-7 sensilla placodea on each segment of the flagellum, arranged lengthways in parallel rows. There are very few sensilla styloconica on the female antennae. The tibiae have mostly sensilla chaetica, whereas three types of ST and the relatively plentiful sensilla chaetica are present on the tarsi. Besides ST, a mass of sensilla squamiformia and small short spines are distributed on the pulvilli. Basically there are no sensilla on the female ovipositor, only steering mechanisms for drilling bark and a variety of v-shaped grooves. However, a large numbers of short sensilla chaetica and microtrichia are found on the internal surface of ovipositor sheath. The outer surface of the ovipositor sheath also has ST. In addition, a clear spring-like extension structure can be observed on the fore parts of ovipositor sheath. These findings suggest that the main function of sensilla on the antennae is olfaction, while the sensilla on legs and ovipositor sheaths are mechanoreceptors and tactile sensors.
为了研究榆绿毛萤叶甲的寄生蜂——中华柄腹茧蜂的寄主寻找机制，对其触角、足以及雌蜂产卵器和产卵器鞘上的感器的形态和超微结构进行了扫描电镜观察。结果表明：雌雄触角上均分布有丰富的毛形感器（ST），其中基部具刺窝的锐形毛形感器数量最多。触角鞭节各节上有 6-7 个栉形感器，沿纵向平行排列。雌蜂触角上的刺形感器很少。胫节上大多是刺形感器，跗节上则有 3 种 ST 和相对丰富的刺形感器。除 ST 外，跗节上还分布有大量的鳞形感器和短小的刺。在产卵器上基本没有感器，只有用于钻树皮的导向机构和各种 V 形沟。然而，在产卵器鞘的内表面发现了大量短的刺形感器和微纤毛。产卵器鞘的外表面也有 ST。此外，在产卵器鞘的前部还可以观察到一个清晰的弹簧状延伸结构。这些发现表明，触角上的感器主要起嗅觉作用，而腿和产卵器鞘上的感器则是机械感受器和触觉传感器。
