绿翅绢野螟幼虫头部感器超微结构观察

为探讨和分析绿翅绢野螟Diaphania angustalis(Snellen)幼虫头部感器的功能及其作用机制,通过扫描电镜对其触角和口器上的感器进行了观察。结果表明:绿翅绢野螟幼虫头式为下口式,头部具有触角、上唇、上颚、下颚和下唇。触角短小,位于幼虫头部侧下方,分3节,其梗节和鞭节分布有4种类型的感器,即毛形感器、短毛感器、锥形感器和栓锥形感器。口器分为上唇、上颚、下颚和下唇4个部分,共具有6种类型感器,分别为毛形感器、刺形感器、指形感器、锥形感器、栓锥形感器和小感觉锥。刺形感器数量较多,分布范围广,口器上各部位均有分布;毛形感器仅分布于上唇;指形感器仅分布于内唇;锥形感器仅分布于下颚;栓锥形感器在下颚和下唇皆有分布;指形感器为内唇所特有。

Ultrastructure of the sensilla on larval head of Diaphania angustalis (Snellen) (Lepidoptera: Crambidae)

To explore the functions of the sensilla on larval head of Diaphania angustalis (Snellen), we examined the ultrastructure of larval head by using scanning electron microscopy (SEM). The main findings were: 1) the head was hypognathous; 2) the antennae were located at lower side of the head with 3 segments and 4 types of sensilla-sensilla trichoidea, short sensilla trichoidea, sensilla basiconica and sensilla styloconica; 3) there were 6 types of sensilla on the mouthparts-sensilla trichoidea, sensilla chaetica, sensilla digitiformia, sensilla basiconica, sensilla styloconica, sensilla of epipharynx and sensory pegs. Sensilla chaetica were abundant and widespread; sensilla trichoidea only occurred on labrum; sensilla digitiformia on epipharynx; sensilla basiconica on maxilla; sensilla styloconica on both maxilla and labium, and sensilla of digitiformia on epipharynx.