▁analysis ▁was ▁re vised ▁and ▁expanded ▁with ▁many ▁additional ▁di pl od oc id ▁spec im ens ▁in ▁ 2 0 1 5 , ▁which ▁resolved ▁the ▁relationships ▁of ▁A pat osa urus ▁slightly ▁differently , ▁and ▁also ▁supported ▁separ ating ▁Br ont osa urus ▁from ▁A pat osa urus . ▁ ▁A pat osa urus ▁ajax ▁was ▁named ▁by ▁Marsh ▁in ▁ 1 8 7 7 ▁after ▁Ajax , ▁a ▁hero ▁from ▁Greek ▁myth ology . ▁Marsh ▁designated ▁the ▁incomplete , ▁ju ven ile ▁ske leton ▁Y PM 1 8 6 0 ▁as ▁its ▁hol ot ype . ▁The ▁species ▁is ▁less ▁studied ▁than ▁Br ont osa urus ▁and ▁A . lou is ae , ▁especially ▁because ▁of ▁the ▁incomplete ▁nature ▁of ▁the ▁hol ot ype . ▁In ▁ 2 0 0 5 ▁many ▁spec im ens ▁in ▁addition ▁to ▁the ▁hol ot ype ▁were ▁found ▁assign able ▁to ▁A . ajax , ▁Y PM 1 8 4 0 , ▁NS MT - P V ▁ 2 0 3 7 5 , ▁Y PM 1 8 6 1 , ▁and ▁AM N H 4 6 0 . ▁The ▁spec im ens ▁date ▁from ▁the ▁late ▁Kim mer id g ian ▁to ▁the ▁early ▁T ith onian ▁ages . ▁In ▁ 2 0 1 5 ▁only ▁the ▁A . ajax ▁hol ot ype ▁Y PM 1 8 6 0 ▁assigned ▁to ▁the ▁species , ▁with ▁AM N H 4 6 0 ▁found ▁either ▁to ▁be ▁within ▁Br ont osa urus , ▁or ▁potentially