食蚜瘿蚊触角的扫描电镜观察

用扫描电子显微镜对食蚜瘿蚊角角进行了观察.结果显示,雌雄触角都为14节,其中雄性约为2000μm,雌性约为1 050μm.电镜下可观察到食蚜瘿蚊触角有6种类型的感受器,即：刺形感受器、毛形感受器、锥形感受器、腔形感受器、柱形感受器和环丝.刺形感受器较长,约67.5μm,基部有膜状的窝.毛形感受器长约61μm,末端弯曲.锥形感受器呈钉状着生在表皮上,长约4.7μm.腔形感受器呈凹陷状,腔的直径约为1.2μm.柱形感受器着生在雄虫鞭节的第二亚节,长约21μm,直径约为1.5μm.环丝,是瘿蚊类昆虫触角中特殊的结构,它通过着生在一系列腔中的的短梗,连结成环状附着在触角各亚节的表面.刺形和锥形感受器在数量上,雌雄之间差别不大；柱形感受器只在雄虫中发现；雄虫触角上的腔形感受器在数量上要比雌虫多.

Scanning Electron Microscopy of Antennae of Aphidoletes aphidimyza (Diptera: Cecidomyiidae)

The morphology of antennae of Aphidoletes aphidimyza was observed with a scanning electronmicroscope.The results showed that both male and female were fourteen segmented,the male was approximately 2000μm and the female was 1050μm.Six types of sensillae on the antenna were observed,viz.chaetica(Ch),trichoidea(Tr)-basiconica(Ba),cavity(Ca),styloid(St)and circumfila(Ci)on the antennae of A.aphidimyza.Sensillae Ch had a longexternal-process,with a base surrounded by membranous sockets and a length of about 67.5 μm.Sensillae Tr were distallycurved and inserted into a depression,61.0μm long.Sensillae Ba were peg-like and 4.7μm long on the antennae.SensillaeCa were pit-like in appearance and the diameter of the pit was 1.2μm.Sensilla St was found on the second sub-segmentflagellum of the male antennae.The length of the sensilla was about 21μm and the diameter was 1.5μm.The circumfila,which are a unique type of sensilla found only on cecidomyiid antennae,formed loops around each of the antennalsub-segments,and were attached to the surface by a series of stalks.Sensilla St was only present on male antenna. Thenumber of Ba and Tr was almost the same in both sexes.There were more Sensilla Ca on the male antenna than on thefemale,while there was more Ch on the female.