▁study ▁in ▁ 2 0 1 6 ▁resolved ▁much ▁of ▁the ▁ph y log eny , ▁though ▁the ▁pla cement ▁of ▁D end ro sc ans or ▁was ▁un resol ved ▁due ▁to ▁lack ▁of ▁DNA ▁testing ▁due ▁to ▁the ▁r ar ity ▁of ▁its ▁remains . ▁It ▁was ▁found ▁that ▁X en icus ▁was ▁par ap hy let ic ▁with ▁respect ▁to ▁P ach y pl ich as , ▁and ▁that ▁the ▁st out ▁le gg ed ▁wr ens ▁must ▁have ▁evol ved ▁from ▁a ▁gra cile ▁le gg ed ▁ancest or , ▁and ▁the ▁paper ▁suggested ▁placing ▁the ▁P ach y pl ich as ▁species ▁within ▁X en icus . ▁It ▁was ▁also ▁found ▁that ▁the ▁split ▁between ▁Ly all ' s ▁w ren ▁and ▁other ▁ac an this itt ids ▁probably ▁took ▁place ▁during ▁the ▁O lig oc ene , ▁over ▁ 3 0 ▁million ▁years ▁ago ▁so ▁ac an this itt ids ▁must ▁have ▁surv ived ▁the ▁O lig oc ene ▁d row ning . ▁A ▁cl ad ogram ▁is ▁given ▁below : ▁ ▁Species ▁Gen us ▁A can this it ta ▁ ▁R if le man : ▁A can this it ta ▁ch lor is ▁Gen us ▁X en icus ▁ ▁† B ush w ren , ▁X en icus ▁long ipes ▁ ▁New ▁Zealand ▁rock ▁w ren ▁or ▁South ▁Island ▁w ren , ▁X en icus ▁g il viv ent ris ▁Gen us ▁Tra vers ia ▁ ▁† L y all ' s ▁w ren ▁or ▁Steph