三种蝇类昆虫(双翅目)足爪垫结构的超微形态研究

ULTRASTRUCTURAL MORPHOLOGY OF THE PULVILLI IN MUSCA DOMESTICA, BERCAEA CRUENTATA AND CHRYSOMYA PINGUIS (DIPTERA)

利用扫描电子显微镜对双翅目3种蝇类昆虫即家蝇Musca domesticaL.(蝇科)、红尾粪麻蝇Bercaea cruentata(Meigen)(麻蝇科)和肥躯金蝇Chrysomya pinguis(Walker)(丽蝇科)足的爪垫超微形态结构进行了研究,研究发现每种蝇类的前、中、后足爪垫的面积存在一定的差别,中足和后足爪垫面积较前足大;爪垫腹面均密被刚毛,每根刚毛由刚毛杆(setal shaft)和末端平板(terminal plate)组成,刚毛主要有铲状、勺状和柳叶状3种类型;后足爪垫上刚毛的密度和刚毛末端面积一般小于前、中足;位于爪垫边缘处的刚毛较长。研究还发现爪垫上的刚毛均为中空结构,且丽蝇科昆虫的刚毛末端具开口。

The ultrastructure of the pulvilli of three fly species, viz. Musca domestica L. (Muscidae), Bercaea cruentata (Meigen) (Sarcophagidae) and Chrysomya pinguis (Walker) (Calliphoridae) was studied with the scanning electron microscopy. In each species, the size of the ventral surface of pulvilli on the fore, middle and hind legs is different. The ventral area of pulvilli on the middle and hind legs is larger than that of the fore legs. The ventral surface of pulvilli is fully covered with numerous tenent setae. The setae consists of the basal elongate setal shaft and an distal tip. Three kinds of tenent setae, viz. spatula-like, spoon-like and willow leaf-like tenent setae were found. The setal shaft on marginal area of the pulvillus is longer than that in other areas. Both the size of the tip area and the density of tenent setae of pulvilli on hind legs are smaller than those on the fore and middle legs. The setal shaft is hollow centrally. A ventral opening on the setal tip was observed in Chrysomya pinguis (Calliphoridae).