Morphology and histology of secretory setae in terrestrial larvae of biting midges of the genus Forcipomyia (Diptera: Ceratopogonidae) |
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Authors: | Urbanek Aleksandra Richert Malwina Giłka Wojciech Szadziewski Ryszard |
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Institution: | aDepartment of Invertebrate Zoology, University of Gdańsk, Al. Pi?sudskiego 46, 81–378 Gdynia, Poland;bDepartment of Molecular Biology, Laboratory of Electron Microscopy, University of Gdańsk, ul. K?adki 24, 80–822 Gdańsk, Poland |
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Abstract: | Apneustic larvae of the genus Forcipomyia possess unique secretory setae located on the dorsal surface along the body in two rows, one pair on each thoracic and abdominal segment and two pairs on the head. Morphological and histological studies of secretory setae in fourth instar larvae of Forcipomyia nigra (Winnertz) and Forcipomyia nigrans Remm indicate they are modified mechanoreceptors (sensilla trichodea) in which the trichogen cell is a glandular cell producing a hygroscopic secretion. The cytoplasm of the glandular trichogen cell fills the lumen of a secretory seta, which shows one or more pores on the apex. The cytoplasm contains numerous microtubules responsible for transportation of proteinaceous vesicles, and an extremely large polyploid nucleus typical of gland cells. The main role of the hygroscopic secretion is to moist the body and thus facilitate cuticular respiration. |
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Keywords: | Ceratopogonidae Forcipomyia Larva Secretory seta Glandular cell Hygroscopic secretion Cuticular respiration |
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