part of larval labiohypopharynx larval hypopharynx Fig 55,56,57 Abbr: Hy in ISBN:0-937548-00-6. TGMA:0001137 TGMA:0001137 The median postoral appendage of the head. In mosquito, dixid and certain other nematocerous larvae, separated from the prelabium by the salivary meatus, but united with it laterally by the cibarial bars to form the labiohypopharynx. arch of heavy chitin default_namespace hypopharyngeal lobe hypopharyngeal sclerite main dorsal part