part of larval labium prelabium Fig 55,56 Abbr: pLb in ISBN:0-937548-00-6. TGMA:0000883 TGMA:0000883 The distal part of the labium comprising the prementum, ligula and labial palpi. In mosquito and certain other nematocerous larvae, separated from the hypopharynx by the salivary meatus but united with it laterally by the cibarial bars to form the labiohypopharynx. default_namespace larval labiohypopharynx anatomical cluster