erc id oc er us ▁vid u us ▁ ▁C erc id oc er us ▁x - r ub rum ▁ ▁References ▁▁▁ ▁Bis by ▁F . A ., ▁Ros kov ▁Y . R ., ▁Or rell ▁T . M ., ▁Nicol son ▁D ., ▁P ag l ina wan ▁L . E ., ▁B ail ly ▁N ., ▁Kirk ▁P . M ., ▁Bour go in ▁T ., ▁Ba ill ar geon ▁G ., ▁O uv r ard ▁D . ▁( red .) ▁( 2 0 1 1 ). ▁http :// www . catalog ue of life . org / ann ual - check list / 2 0 1 1 / search / all / key / cer cid oc er us / match / 1 ▁Catalogue ▁of ▁Life ▁ ▁W ta xa ▁ ▁Category : D ry oph th or inae <0x0A> </s> ▁R hen ium – os m ium ▁d ating ▁is ▁a ▁form ▁of ▁radi ometric ▁d ating ▁based ▁on ▁the ▁beta ▁decay ▁of ▁the ▁is ot ope ▁ 1 8 7 Re ▁to ▁ 1 8 7 Os . ▁ ▁This ▁normally ▁occurs ▁with ▁a ▁half - life ▁of ▁ 4 1 . 6 ▁× ▁ 1 0 9 ▁y , ▁but ▁studies ▁using ▁fully ▁ion ised ▁ 1 8 7 Re ▁atoms ▁have ▁found ▁that ▁this ▁can ▁decrease ▁to ▁only ▁ 3 3 ▁y . ▁Both ▁r hen ium ▁and ▁os m ium ▁are ▁strongly ▁s ider oph il ic ▁( ir on ▁lov ing ), ▁while