The meadow spittlebug, Philaenus spumarius (Linnaeus) (Hemiptera: Aphrophoridae), is an important vector for the xylem-limited bacterium Xylella fastidiosa (Wells, Raju, Hung, Weisburg, Mandelco-Paul, and Brenner), which is associated with olive quick decline syndrome in southern Italy. The mouthparts of Hemiptera have important roles in host plant selection, feeding behavior and for vectoring pathogens that cause plant diseases. In this study, the functional morphology of the sensory structures located on the labium tip and precibarium of P. spumarius was investigated using scanning and transmission electron microscopy. The labium tip is composed of two symmetrical sensory complexes, each with five different types of sensilla: aporous sensilla trichodea type 1 and 2; uniporous sensilla chaetica type 1 and 2; and multiporous sensilla basiconica. The precibarium of P. spumarius has two kinds of sensory structures: bulbous sensilla and papillae sensilla. In particular, two groups of sensilla are located on the epipharynx: a distal group that consists of ten papillae sensilla and a proximal group composed of six papillae sensilla and two bulbous sensilla, while the hypopharynx has only two papillae sensilla. The involvement of these sensory structures in the context of feeding behavior and pathogen transmission is discussed.

中文翻译：

---

与Philaenus spumarius L.（半翅目：Aphrophoride）的唇尖和前胎轴相关的感觉受体。

草地上的瓢虫，Philaenus spumarius（Linnaeus）（半翅目：Aphrophoridae），是木质部限制细菌Xylella fastidiosa（Wells，Raju，Hung，Weisburg，Mandelco-Paul和Brenner）的重要载体，与橄榄快意大利南部的衰退症候群。半翅目的口器在寄主植物的选择，取食行为以及引诱引起植物病原体的病原体方面起着重要作用。在这项研究中，使用扫描和透射电子显微镜研究了位于P. spumarius的唇侧尖端和前丘脑的感觉结构的功能形态。唇尖由两个对称的感官复合体组成，每个复合体均具有五种不同类型的感官：多孔性感性毛线虫1型和2型；毛孔性1型和2型。单孔感觉型chaetica 1型和2型；和多孔性感性碱。P. spumarius的prebararium具有两种感觉结构：球茎型感官和乳头状感官。特别地，在鼻咽上有两组感觉器：由十个乳头感觉器组成的远端组和由六个乳头感觉器和两个球茎型感觉器组成的近端组，而下咽只有两个乳头感觉器。讨论了在进食行为和病原体传播的背景下这些感觉结构的参与。