▁and ▁four ▁under ▁the ▁mol ars . ▁ ▁On ▁the ▁mand ible , ▁the ▁di ast ema ▁is ▁very ▁large ▁and ▁the ▁in cis or ▁is ▁proc umb ent ▁( project ing ▁forward ), ▁which ▁distingu ishes ▁A pe om yo ides ▁from ▁most ▁e omy ids ▁apart ▁from ▁M ega pe om ys . ▁There ▁is ▁a ▁mass eter ic ▁scar ▁( associ ated ▁with ▁the ▁j aw ▁mus cles ) ▁from ▁below ▁the ▁m 1 ▁forward ▁to ▁a ▁point ▁in ▁front ▁of ▁p 4 , ▁below ▁the ▁mental ▁for amen , ▁an ▁opening ▁in ▁the ▁j aw bone . ▁In ▁A pe om ys ▁and ▁M ega pe om ys ▁this ▁scar ▁only ▁reaches ▁to ▁the ▁level ▁of ▁the ▁front ▁root ▁of ▁p 4 . ▁The ▁mental ▁for amen ▁is ▁very ▁small ▁and ▁opens ▁in ▁the ▁di ast ema , ▁near ▁the ▁vent ral ▁sh elf ▁of ▁the ▁scar ; ▁in ▁A pe om ys ▁and ▁M ega pe om ys ▁it ▁is ▁located ▁near ▁the ▁d ors al ▁sh elf . ▁Further ▁foram ina ▁are ▁present ▁on ▁the ▁ling ual ▁( inner ) ▁surface ▁of ▁the ▁b one , ▁below ▁the ▁che ek te eth . ▁ ▁Distribution ▁and ▁e col ogy ▁ ▁A pe om yo ides ▁sav age i ▁is ▁from ▁the ▁East gate ▁local ▁fa una ▁in ▁the ▁Mon arch ▁Mill ▁Form ation ▁of ▁Church ill ▁County , ▁Nev ada . ▁This ▁fa una ▁dates ▁to ▁the ▁early ▁Bar st ov ian ▁land ▁m amm al ▁age