▁ 2 3 S ▁if ▁available ) ▁tree ▁of ▁all ▁valid ated ▁species . ▁The ▁genus ▁Bac ill us ▁contains ▁a ▁very ▁large ▁number ▁of ▁nested ▁tax a ▁and ▁major ly ▁in ▁both ▁ 1 6 S ▁and ▁ 2 3 S . ▁It ▁is ▁par ap hy let ic ▁to ▁the ▁L act ob ac ill ales ▁( L act ob ac ill us , ▁Stre pt oc oc cus , ▁St ap hy loc oc cus , ▁L ister ia , ▁etc .), ▁due ▁to ▁Bac ill us ▁co ah uil ensis ▁and ▁others . ▁ ▁A ▁third ▁proposal , ▁presented ▁in ▁ 2 0 1 0 , ▁was ▁a ▁gene ▁concaten ation ▁study , ▁and ▁found ▁results ▁similar ▁to ▁the ▁ 2 0 0 8 ▁proposal , ▁but ▁with ▁a ▁much ▁more ▁limited ▁number ▁of ▁species ▁in ▁terms ▁of ▁groups . ▁( This ▁scheme ▁used ▁L ister ia ▁as ▁an ▁out group , ▁so ▁in ▁light ▁of ▁the ▁AR B ▁tree , ▁it ▁may ▁be ▁" inside - out "). ▁ ▁One ▁cla de , ▁formed ▁by ▁Bac ill us ▁anth rac is , ▁Bac ill us ▁c ere us , ▁Bac ill us ▁my co ides , ▁Bac ill us ▁pseud omy co ides , ▁Bac ill us ▁th uring i ensis , ▁and ▁Bac ill us ▁we i hen ste phan ensis ▁under ▁the ▁ 2 0 1 1 ▁classification ▁standards , ▁should ▁be ▁a ▁single ▁species ▁( with in ▁ 9 7 % ▁ 1 6 S