Ultrastructure of Sensilla on Antenna and Thoracic Leg on the Male Adult of Chelonus sp. of Spodoptera frugiperda

PurposeTo observe the types, morphology and distribution of sensilla on antenna and thoracic leg on male adult of parasitoid of Chelonus sp. of Spodoptera frugiperda.

MethodsThe ultrastructure of sensilla on antenna and thoracic leg (propodeum, mesopdium and metapodium) was observed with scanning electron microscopy.

ResultsFive kinds of sensilla on male adult of parasitoid of Chelonus sp. of S. frugiperda, including sensilla trichodea (three subtype I-III), sensilla placodea, sensilla chaetica, sensilla basiconica (four subtype I-IV) and sensillum campaniform were observed. Sensilla trichode and sensilla basiconica were observed both antenna and thoracic leg. Most of sensilla trichoidea were most widely distributed on parasitoid of Chelonus sp. of S. frugiperda. Sensilla placodea was only found on flagellum of antenna. Sensillum campaniform was only found on femur of mesopdium.

ConclusionThere are various sensilla types of antennae and thoracic leg on male adult of Chelonus sp., but the distribution of different sensillaries is different, which provides a theoretical basis for the study of the behavior mechanism of the parasitoid wasp of S. frugiperda.