og ra pt us ▁is ▁an ▁ext inct ▁genus ▁of ▁gra pt ol ites ▁with ▁four ▁rows ▁of ▁cu ps . ▁They ▁lived ▁during ▁the ▁Middle ▁Ord ov ician , ▁to ▁Late ▁Ord ov ician . ▁ ▁Distribution ▁ ▁F oss ils ▁of ▁Did ym og ra pt us ▁have ▁been ▁found ▁in ▁Argentina , ▁Australia , ▁Boliv ia , ▁Canada ▁( N orth west ▁Territ ories , ▁Quebec , ▁Y uk on , ▁New found land ▁and ▁Lab r ador ), ▁Chile , ▁China , ▁Colombia ▁( T ar qui , ▁Hu ila ), ▁the ▁Czech ▁Republic , ▁Est onia , ▁France , ▁Iran , ▁Mor oc co , ▁New ▁Zealand , ▁Norway , ▁Peru , ▁Portugal , ▁the ▁Russian ▁Federation , ▁Sa udi ▁Arab ia , ▁Spain , ▁Sweden , ▁the ▁United ▁Kingdom , ▁the ▁United ▁States ▁( Al aska , ▁California , ▁Id aho , ▁Nev ada , ▁New ▁York , ▁Ut ah ), ▁and ▁Venezuela . ▁ ▁References ▁ ▁Bibli ography ▁▁▁▁ ▁Category : G ra pt ol ite ▁gener a ▁Category : Ord ov ician ▁in verte br ates ▁Category : P ale oz o ic ▁animals ▁of ▁O ce ania ▁Category : Ord ov ician ▁animals ▁of ▁Africa ▁Category : Ord ov ician ▁animals ▁of ▁Asia ▁Category : Ord ov ician ▁animals ▁of ▁Europe ▁Category : Ord ov ician ▁animals ▁of ▁North ▁America ▁Category : Ord ov ician ▁Canada ▁Category : Ord ov ician ▁United ▁States ▁Category : Ord ov ician ▁animals ▁of ▁South ▁America ▁Category :