Ultrastructure of antennal sensilla of adult Orthaga achatina with a scanning electromicroscope
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Key Words：Orthaga achatina, antenna, sensilla, scanning electromicroscope (SEM)
Abstract： The morphological structure of the antennae in adult Orthaga achatina Butler were observed with a scanning electron microscope. The antennae of both male and female moths consisted of scape, pedicel and flagellar segments, the flagellar segment containing 75-85 subsegments. The dorsal side of the antennae is covered by dense scales, while the ventral and lateral sides possess the most sensilla. The surface of the flagellar segment is characterized by reticular cuticle, but the scape and pedicel segments lack this characteristic. There are 8 types of sensilla found on the antennae of males and females; sensilla trichodea, sensilla chaetica, sensilla coeloclnica, sensilla auricillica, sensilla squamiformia, sensilla styloconica, Bohm bristles and sensilla cavitata-peg. Of these, the sensilla trichodea are the most abundant and can be morphologically subdivided into two distinct types (Type I and TypeⅡ). All sensilla, with the exception Bhm bristles, occur on the reticular area of the flagellar segment. There is no difference in sensilla types and their distribution between male and female.