▁a ▁st ump ▁of ▁dent ine , ▁ 2 . 3   mm ▁( 0 . 0 9 1 ▁in ) ▁long ▁and ▁ 1 . 9   mm ▁( 0 . 0 7 5 ▁in ) ▁broad , ▁that ▁extends ▁high ▁above ▁the ▁dent ary , ▁indicating ▁that ▁the ▁to oth ▁was ▁hy ps od ont ▁( high - c rown ed ). ▁High ▁dent ine ▁st umps ▁also ▁remain ▁of ▁the ▁fourth ▁and ▁fifth ▁che ek te eth . ▁The ▁fourth ▁is ▁about ▁as ▁large ▁as ▁the ▁first ▁and ▁second ▁and ▁the ▁fifth ▁is ▁smaller , ▁with ▁a ▁diameter ▁of ▁about ▁ 1 . 0   mm ▁( 0 . 0 3 9 ▁in ). ▁The ▁fourth ▁che ek to oth ▁also ▁has ▁a ▁long , ▁cur ved ▁root , ▁which ▁extends ▁more ▁than ▁half way ▁through ▁the ▁dent ary , ▁and ▁that ▁of ▁the ▁fifth ▁to oth ▁is ▁even ▁smaller ▁and ▁shorter . ▁The ▁orientation ▁of ▁the ▁roots ▁and ▁teeth ▁indicates ▁that ▁all ▁the ▁teeth ▁were ▁single - root ed . ▁ ▁Identity ▁The ▁dent ary ▁super f icial ly ▁res emb les ▁that ▁of ▁various ▁other ▁m amm al ian ▁groups ▁with ▁en larg ed ▁in cis ors , ▁such ▁as ▁rod ents , ▁lag omorph s , ▁hy ra xes , ▁w omb ats , ▁the ▁a ye - aye , ▁and ▁the ▁ext inct ▁ap at emy ids , ▁till od ont s , ▁and ▁ta en iod ont s — all ▁of ▁which ▁are ▁known ▁only