op og on idae ▁Ph le bot om inae ▁Hi pp ob osc idae , H ydro ta ea ▁and ▁Phil orn is ▁down si ( Mus c idae ) ▁Sp ani opsis ▁and ▁Sym ph or omy ia ▁Rh ag ion idae . ▁There ▁are ▁no ▁known ▁a cal y ptr ates ▁that ▁are ▁oblig ate ▁blood - feed ers . ▁ ▁Lar va e ▁The ▁lar va e ▁of ▁D ip tera ▁feed ▁on ▁a ▁diverse ▁array ▁of ▁nut ri ents ▁; ▁often ▁these ▁are ▁different ▁from ▁those ▁of ▁adult s , ▁for ▁instance ▁the ▁lar va e ▁of ▁S yr ph idae ▁in ▁which ▁family ▁the ▁adult s ▁are ▁flower - feed ing ▁are ▁sap rot roph s , ▁e ating ▁decay ing ▁plant ▁or ▁animal ▁matter , ▁or ▁insect iv ores , ▁e ating ▁a ph ids , ▁th ri ps , ▁and ▁other ▁plant - su ck ing ▁insect s . ▁ ▁Lar val ▁D ip tera ▁feed ▁in ▁leaf - l itter , ▁in ▁leaves , ▁st ems , ▁roots , ▁flower ▁and ▁seed ▁heads ▁of ▁plants , ▁m oss , ▁fung i , ▁ro tt ing ▁wood , ▁ro tt ing ▁fruit ▁or ▁other ▁organ ic ▁matter ▁such ▁as ▁sl ime , ▁flow ing ▁sap , ▁and ▁ro tt ing ▁c act i , ▁car r ion , ▁d ung , ▁det rit us ▁in ▁m amm al ▁bird ▁or ▁was p ▁n ests , ▁fine ▁organ ic ▁material ▁including ▁insect ▁fr ass ▁and ▁micro -