▁lar va e . ▁ ▁F resh water ▁D ip tera ▁Lar val ▁stages ▁of ▁D ip tera ▁can ▁be ▁found ▁in ▁almost ▁any ▁aqu atic ▁or ▁sem ia qu atic ▁habitat ▁They ▁form ▁an ▁important ▁fraction ▁of ▁the ▁macro ▁zo ob enth os ▁of ▁most ▁fresh water ▁e cos ystem s . ▁ ▁families ▁are ▁Ch ir onom idae ▁( very ▁significant ), ▁Str ati omy idae , ▁E ph yd r idae , ▁ ▁D ix idae ▁and ▁T ip ul idae . ▁ ▁Fe eding ▁Food ▁hab its ▁of ▁most ▁species ▁are ▁largely ▁unknown ▁but ▁broad ▁statements ▁may ▁be ▁made . ▁D ip tera ▁are ▁important ▁pol lin ators ▁and ▁plant ▁p ests . ▁ ▁F lower ▁feed ers ▁Many ▁adult ▁Bra ch yc era ▁feed ▁on ▁flowers ▁not ably ▁ ▁S yr ph idae ▁which ▁obtain ▁all ▁their ▁protein ▁requirements ▁by ▁feed ing ▁on ▁pol len . ▁The ▁Cal y ptr ata e ▁exhib it ▁flower ▁feed ing ▁in ▁all ▁families ▁except ▁Hi pp ob osc idae ▁Ny ct ere b idae ▁and ▁G loss in idae ▁and ▁in ▁the ▁A cal y ptr ata e ▁the ▁Con op idae ▁are ▁well ▁known ▁flower ▁feed ers . ▁Other ▁flower ▁feed ing ▁Bra chy cer ous ▁families ▁are ▁ ▁Emp id idae , ▁Str ati omy idae ▁and ▁the ▁Ac ro cer idae ▁like ▁various ▁members ▁of ▁the ▁ ▁Nem estr in idae , ▁ ▁Bom by li idae ▁and ▁T aban idae ▁ ▁are ▁ne ct ar ▁feed ers