). ▁ ▁The ▁ph y log en etic ▁relationships ▁of ▁the ▁large ▁Mind oro ▁forest ▁mouse ▁can ▁be ▁summar ized ▁as ▁follows . ▁ ▁This ▁study ▁also ▁found ▁that ▁the ▁large ▁Mind oro ▁forest ▁mouse ▁was ▁the ▁only ▁Ap om ys ▁species ▁that ▁displayed ▁deep ▁within - species ▁diver gen ces , ▁which ▁were ▁calculated ▁to ▁date ▁back ▁some ▁ 4 0 0 . 0 0 0 ▁years . ▁The ▁split ▁between ▁the ▁large ▁Mind oro ▁forest ▁mouse ▁and ▁the ▁Lu zon ▁mont ane ▁forest ▁mouse ▁dates ▁back ▁further ▁still ▁at ▁an ▁estimated ▁three ▁million ▁years ▁ago , ▁putting ▁it ▁in ▁the ▁P li oc ene . ▁Ap om ys ▁itself ▁in ▁turn ▁was ▁found ▁to ▁date ▁back ▁more ▁than ▁four ▁million ▁years , ▁while ▁the ▁Ch rom ot ys ▁division ▁was ▁estimated ▁to ▁go ▁back ▁another ▁two ▁million ▁years . ▁These ▁dates ▁were ▁all ▁calculated ▁using ▁a ▁mole cular ▁clock . ▁ ▁Another , ▁more ▁elaborate ▁ph y log en etic ▁study ▁on ▁all ▁of ▁the ▁en demic ▁Filip ino ▁gener a ▁and ▁species ▁of ▁Mur inae , ▁of ▁which ▁the ▁large ▁Mind oro ▁forest ▁mouse ▁is ▁a ▁member , ▁produced ▁different ▁results . ▁According ▁to ▁this ▁study , ▁the ▁Ch rom ot ys ▁division ▁origin ated ▁some ▁ten ▁million ▁years ▁ago ▁( r ather ▁than ▁the ▁estimate ▁of ▁six ▁million ▁years ▁ago ▁from ▁the ▁previous ▁study ). ▁It ▁was ▁further ▁calculated ▁that ▁the ▁split ▁between ▁the ▁Ch rom ot ys ▁division ▁and ▁its ▁closest ▁relatives , ▁a ▁pre domin antly ▁African