Putative Sensory Structures Associated with the Food Canal of Hybomitra difficilis (Diptera: Tabanidae).
DOI:
https://doi.org/10.55632/pwvas.v89i2.307Keywords:
Hybomitra difficilis, food canal, labrum, sensillaAbstract
The feeding tube of Hybomitra difficilis is made up of a short distal vestibule followed by a food canal that leads to the cibarium; the two regions demarcated by the vestibule/food canal junction. Two pairs of sensilla were consistently observed in the vestibular walls, the first pair of basiconic design in the mid-vestibular region, and the latter pair of setiform design at the base of the vestibule. Numbers of setiform sensilla in the food canal varied from 31 to 69 (mean = 48.15; ± 1 SD = 10.02), and were aggregated in the distal and distal median regions of the food canal. This aggregation was significant (X 2 = 241.49; P < 0.0001), leading to rejection of the null hypothesis that setiform sensilla were evenly distributed throughout the length of the food canal.
Two basiconic sensilla were observed in the food canal of every fly examined. While basiconic sensilla varied in position (i.e., distance) from the vestibule/food canal junction, they were significantly aggregated (X 2 = 14.42; P < 0.0024) in the two median sections of the distal canal region, thus leading to the rejection of Ho that basiconic sensilla were evenly distributed in subdivisions (i.e., sections) of the distal canal region.
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