Section 1
Chapter 567

Ultrastructural observations of the respiratory siphon of the fourth instar Culex pipiens pipiens larva subjected to chemical monolayers

Badalamente, M.A.; Kozenko, C.L.; Flemings, M.B.

Annals of the Entomological Society of America 69(1): 114-116


ISSN/ISBN: 0013-8746
DOI: 10.1093/aesa/69.1.114
Accession: 000566800

In fourth-instar larvae of Culex pipiens pipiens L., the perispiracular gland of the respiratory siphon is the site of lipid synthesis. Challenged by water insoluble monolayers of 1-hexadecanol or stearic acid, this gland increases lipid production and thus acts as a hydrostatic defence against 'wetting' of the siphon, which is closely associated with drowning. Within the perispiracular gland, the endoplasmic reticulum appears active in lipid synthesis. Transport of lipid into the tracheal lumen of the siphon is most probably facilitated by microvilli. The mortality of larvae treated with 1-hexadecanol and stearic acid chemical monolayers, respectively, was 20 and 50% mortality after 24 h.

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