part of siphon Atemtubus Fig 63,64,65,67,68,72 Abbr: S Applied to non Anopheles mosquitoes. in ISBN:0-937548-00-6. In culicine, toxorhynchitine and certain chaoborid larvae, the dorsally-located, elongate sclerotized tube (incompletely developed in early instars) of abdominal segment VIII; bearing the spiracular apparatus at its apex; structurally comprising parts of embryonic abdominal segments VIII and IX; at least partly homologous with the pecten plate and U-shaped band of anopheline larvae. Siphonalrohr TGMA:0000554 TGMA:0000554 air siphon air tube anal siphon anal tube breathing horn breathing siphon breathing tube default_namespace postabdominal respiratory siphon postabdominal spiracular siphon respiratory siphon respiratory syphon respiratory tube siphon-tube siphonal tube syphon tube tube larval abdominal segment VIII