Thrips are important pests to alfalfa Medicago sativa. Similar as many other plant-feeding insects, thrips rely on the antennae to receive chemical signals in the environment to locate their hosts. Previous studies indicated that sensilla of different shapes on the surface of insect antenna play an important role in signal recognition. However, morphological analysis of the antennal sensilla in Thysanoptera has been limited to only a few species. To expand the understanding of how antennal sensilla are related to semiochemical detection in thrips, here we compared the morphology and distribution of antennal sensilla in three thrip species, Odontothrips loti, Megalurothrips distalis, and Sericothrips kaszabi, by scanning electron microscope (SEM). The antennae of these three species are all composed of eight segments and share similar types of sensilla which distribute similarly in each segment, despite that their numbers show sexual dimorphism. Specifically, nine major types of sensilla in total were found, including three types of sensilla basiconica (SBI, SBII, and SBIII), two types of sensilla chaetica (SChI and SChII), and one type for each of sensilla coeloconica (SCo), sensilla trichodea (ST), sensilla campaniformia (SCa), and sensilla cavity (SCav). The potential functions of sensilla were discussed according to the previous research results and will lay a morphological foundation for the study of the olfactory mechanism of three species of thrips.

中文翻译：

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苜蓿紫花苜蓿的三种蓟马（Thysanoptera）触角感触的形态和分布

蓟马是苜蓿紫花苜蓿的重要害虫。与许多其他以植物为食的昆虫类似，蓟马依靠触角在环境中接收化学信号来定位其宿主。先前的研究表明，昆虫天线表面上不同形状的感官在信号识别中起着重要作用。但是，Th翅类触角感应器的形态学分析仅限于少数几种。为了扩大对触角感官与蓟马中的化学信息检测之间的关系的了解，在这里我们比较了三种蓟马触角触角的形态和分布，这三种蓟马分别为：齿臭​​蛇（Odontothrips loti），远侧巨嘴猴（Megalurothrips远侧）和绢线虫（Sricothriprips kaszabi）。，通过扫描电子显微镜（SEM）。这三个物种的触角全部由八个部分组成，并且共享相似类型的感官，尽管它们的数量显示出性二态性，但它们在每个部分中的分布相似。具体而言，总共发现了9种主要类型的感官，其中包括三种类型的基础感官（SBI，SBII和SBIII），两种感官性感（SChI和SChII），每种感官性感官（SCo）分别为一种，感性毛细支气管炎（ST），感性坎帕尼菌病（SCa）和感性腔（SCav）。根据先前的研究结果，探讨了感官的潜在功能，并将为研究三种蓟马的嗅觉机制奠定形态基础。