ing og aster .. M yd idae ▁are ▁m im ics ▁of ▁st ing ing ▁H ymen optera . ▁ ▁Be hav iour ▁F lies ▁give ▁visual ▁( as ▁distinct ▁from ▁chemical ▁or ▁other ) ▁signals ▁during ▁court ship . ▁ ▁Sex ual ▁selection ▁and ▁Court ship ▁Many ▁D ip tera ▁exhib it ▁sexual ▁selection ▁and ▁several ▁patterns ▁of ▁sexual ▁shape ▁dim orphism , ▁such ▁as ▁male ▁body ▁el ong ation , ▁eye ▁stal ks , ▁or ▁extensions ▁of ▁the ▁ex os ke leton , ▁have ▁evol ved ▁repeatedly ▁in ▁the ▁true ▁f lies ▁( D ip tera ). ▁Ph yt alm ia ▁m ould si ▁uses ▁a ▁resource ▁defense ▁m ating ▁system . ▁De uter oph le bia ▁males ▁have ▁extremely ▁long ▁anten na e ▁which ▁they ▁employ ▁when ▁contest ing ▁territ ories ▁over ▁running ▁water , ▁waiting ▁for ▁females ▁to ▁h atch . ▁ ▁Famil ies ▁of ▁a cal y ptr ate ▁f lies ▁exhib iting ▁morph ological ▁development ▁associated ▁with ▁ag on istic ▁behaviour ▁include : ▁Cl us i idae , ▁Di ops idae , ▁D ros oph il idae , ▁ ▁Plat yst om at idae , ▁Te ph rit idae ▁and ▁ ▁Ul idi idae . ▁ ▁Some ▁Emp id idae ▁have ▁an ▁elaborate ▁court ship ▁rit ual ▁in ▁which ▁the ▁male ▁wra ps ▁a ▁pre y ▁item ▁in ▁sil k ▁and ▁presents ▁it ▁to ▁the ▁female ▁to ▁stim ulate ▁cop ulation . ▁ ▁Many ▁observed ▁behav i ours ▁remain ▁un stud ied . ▁ ▁Bi ol um