Sensilla on insect body parts play an important role on their behavior for ovipositing and foraging. To describe the morphology and distribution of sensilla on adults and larvae of C. megacephala, scanning electron miscroscopy was applied to give detailed information. There are five types of sensilla on antenna, three on the proboscis and ovipositor, two on the haltere and leg, and only one on the wing. All body parts bear microtrichia, except for the ovipositor. Mechanoreceptors are present in all body parts of adults. Sensilla on larvae are different from those on adults. Larval antenna is a dome shaped organ located in a cavity on the cephalic region. Four papillae distribute in the ventral organ, and five coeloconic sensilla and several basiconic sensilla are located on maxillary palp of larvae. Many basiconic sensilla are situated on the ventral depression close to posterior spiracular. This is the first overall observation about sensilla on the whole body of C. megacephala adults and larvae, which would have great significance to behavior, identification and evolution of the blow fly.
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