ith et ▁f itz roy ensis ▁because ▁the ▁type ▁spec imen , ▁a ▁ 1 . 2 - m - long ▁female , ▁was ▁collected ▁from ▁Con nor ' s ▁Creek ▁in ▁the ▁Fitz roy ▁River ▁est u ary . ▁Sub sequ ent ▁authors ▁have ▁syn onym ized ▁G ale ol am na ▁with ▁C archar hin us . ▁ ▁The ▁evolution ary ▁relationships ▁of ▁the ▁cre ek ▁wh aler ▁have ▁yet ▁to ▁be ▁fully ▁resolved . ▁In ▁compar ative ▁morph ological ▁studies ▁published ▁by ▁Jack ▁G arr ick ▁in ▁ 1 9 8 2 ▁and ▁Leonard ▁Comp ag no ▁in ▁ 1 9 8 8 , ▁it ▁was ▁tent atively ▁placed ▁in ▁a ▁grouping ▁defined ▁by ▁the ▁white che ek ▁sh ark ▁( C . ▁d uss um ieri ) ▁and ▁the ▁black spot ▁sh ark ▁( C . ▁se ale i ). ▁Sh ane ▁La very , ▁in ▁a ▁ 1 9 9 2 ▁study ▁based ▁on ▁allo zym es , ▁reported ▁that ▁this ▁species ▁was ▁close ▁to ▁the ▁nerv ous ▁sh ark ▁( C . ▁c aut us ) ▁and ▁the ▁black tip ▁re ef ▁sh ark ▁( C . ▁mel an opter us ). ▁X im ena ▁Vé lez - Z u az oa ▁and ▁In gi ▁Ag nar sson , ▁in ▁a ▁ 2 0 1 1 ▁study ▁based ▁on ▁nuclear ▁and ▁mit och ond rial ▁gen es , ▁found ▁it ▁to ▁be ▁the ▁bas al ▁member ▁of ▁a ▁cla de ▁also ▁containing ▁the ▁grace ful ▁sh ark