has_part ventral_to dorsal_to attached_to gnathal pouch fulcrum fulcral arms fulcre Sclerites located between hypopharynx to medial wall of gnathal pouches. CLAO:0000045 Bitsch and Bitsch, 2000 fulcra fulturae hypopharyngeal branches hypopharyngeal fulturae hypopharynx maxilla apodeme labium chitin