Abstract
The fine structure of the sensilla situated at the end of appendages of the first abdominal sternite in both sexes of C. sensillifera (Diplura) reveals that they are mechanoreceptors and taste receptors. Each sensory unit is made of 3 dendrites ensheathed by 3 cells (thecogen, trichogen and tormogen). The thecogen cell is voluminous and secretes a large quantity of a dense secretory material accumulated in a reservoir. At the bottom of this reservoir, the original inner lymph cavity appears as a clear space, surrounding the basal part of the cilia. In the lateral part of the tormogen cell, there is a subspherical cavity in which a lightly electron-dense substance forms a deposit on the wall. This cavity takes form after ecdysis, then the deposit occurs and reaches its maximum thickness during the feeding phase. After apolysis, it is eliminated in exuvial space. It may strengthen the upper part of the cell and improve the reception of mechanical stimuli during the feeding phase.
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