Abstract

We used scanning and transmission electron microscopy to study the olfactory sensilla of the basal flagellar subsegment, or funiculus, of the face fly, Musca autumnahs. Olfactory sensilla on the surface consist of thick-walled sensilla trichodea and 2 types of thin-walled sensilla basiconica; all have a typical pore-tubule system. In addition, the funicular surface has grooved, or fluted, sensilla. Olfactory pits on the ventral surface have numerous thin-walled sensilla basiconica morphologically similar to those on the surface. Female face flies have 2 ventral pits while males have only one. The dorsolateral surface of the funiculus of both sexes also has a single pit, which contains several grooved sensilla and a previously undescribed sensillum with a filamentous tip whose method of communicating with the exterior we could not determine.

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