▁Man ila ▁Category : Form er ▁railway ▁stations ▁in ▁Ark ansas <0x0A> </s> ▁Ol cost e phan us ▁is ▁an ▁ext inct ▁am m ono id ▁ce phal op od ▁genus ▁belonging ▁to ▁the ▁family ▁Ol cost e phan idae . ▁These ▁fast - mov ing ▁ne k ton ic ▁car n iv ores ▁ ▁lived ▁during ▁the ▁C ret ace ous , ▁from ▁the ▁ ▁upper ▁Val ang in ian ▁to ▁the ▁lower ▁Haut er iv ian ▁age . ▁ ▁Species ▁▁ ▁Ol cost e phan us ▁ast ier ian us ▁( d ' Or b igny , ▁ 1 8 4 0 ) ▁ ▁Ol cost e phan us ▁a ther st oni ▁Sh ar pe , ▁ 1 8 5 6 ▁ ▁Ol cost e phan us ▁b aker i ▁I ml ay , ▁ 1 9 3 7 ▁ ▁Ol cost e phan us ▁b ose i ▁R ied el , ▁ 1 9 3 8 ▁ ▁Ol cost e phan us ▁del icate cost atus ▁Ha as , ▁ 1 9 6 0 ▁ ▁Ol cost e phan us ▁det on ii ▁Rod igh iero ▁ 1 9 1 9 ▁ ▁Ol cost e phan us ▁fil ifer ▁I ml ay , ▁ 1 9 3 7 ▁ ▁Ol cost e phan us ▁l atic osta ▁Ger th , ▁ 1 9 2 5 ▁ ▁Ol cost e phan us ▁p auc ic ost atus ▁I ml ay , ▁ 1 9 3 7 ▁ ▁Ol cost e