▁group ▁including ▁Mus , ▁Ot om ys ▁and ▁M ast om ys , ▁had ▁happened ▁about ▁six teen ▁million ▁years ▁ago . ▁However , ▁since ▁the ▁foss il ▁record ▁of ▁Mur inae ▁from ▁the ▁Philippines ▁is ▁non - ex istent , ▁and ▁controvers ial ▁for ▁Mur inae ▁from ▁other ▁areas , ▁these ▁estimates ▁can ▁only ▁be ▁based ▁on ▁the ▁mole cular ▁clock , ▁and ▁not ▁on ▁direct ▁pale ont ological ▁data . ▁ ▁The ▁large ▁Mind oro ▁forest ▁mouse ▁is ▁the ▁third ▁known ▁rod ent ▁en demic ▁to ▁Mind oro , ▁after ▁the ▁Mind oro ▁black ▁rat ▁and ▁the ▁Mind oro ▁clim bing ▁rat , ▁and ▁not ▁including ▁the ▁Il in ▁Island ▁cloud runner , ▁the ▁occurrence ▁of ▁which ▁has ▁not ▁been ▁confirmed ▁on ▁the ▁island . ▁However , ▁in ▁a ▁compilation ▁work ▁on ▁the ▁ind igen ous ▁m amm als ▁of ▁the ▁Philippines , ▁published ▁in ▁ 1 9 9 8 , ▁it ▁was ▁announced ▁that ▁there ▁is ▁a ▁second ▁Ap om ys ▁on ▁Mind oro . ▁This ▁species ▁has ▁yet ▁to ▁be ▁described ▁and ▁has ▁tempor arily ▁been ▁given ▁the ▁name ▁of ▁" Ap om ys ▁sp . ▁E ". ▁It ▁may ▁be ▁related ▁to ▁two ▁other ▁und es cribed ▁species ▁from ▁Sib uy an ▁Island ▁and ▁Gre ater ▁Neg ros - Pan ay , ▁Ap om ys ▁sp . ▁A / C ▁and ▁Ap om ys ▁sp . ▁B . ▁The ▁local ▁population ▁of ▁A . ▁mus cul us , ▁the ▁only ▁other ▁Ap om ys ▁known ▁on ▁the ▁island