od nav ir idae ▁are ▁ icos ah ed ral ▁in ▁shape ▁with ▁a ▁double - str and ed ▁DNA ▁mole c ule . ▁Some ▁members ▁of ▁this ▁family ▁can ▁have ▁a ▁linear ▁double ▁str and ed ▁DNA ▁while ▁others ▁have ▁a ▁circular ▁double ▁str and ed ▁DNA . ▁The ▁gen ome ▁has ▁been ▁found ▁to ▁be ▁up ▁to ▁ 5 6 0 ▁kil ob ases ▁in ▁length . ▁Up ▁to ▁ 5 0 % ▁of ▁the ▁DNA ▁can ▁be ▁represented ▁by ▁gu an ine ▁or ▁c yt os ine . ▁This ▁virus ▁is ▁known ▁to ▁inf ect ▁alg ae , ▁which ▁means ▁it ▁is ▁found ▁in ▁the ▁ocean . ▁ ▁P ith ov ir idae ▁The ▁P ith ov ir idae ▁have ▁only ▁two ▁known ▁represent atives . ▁These ▁vir uses ▁inf ect s ▁am o eb as ▁and ▁can ▁surv ive ▁in ▁low ▁temper atures . ▁For ▁years ▁this ▁virus ▁was ▁believed ▁to ▁be ▁fro zen , ▁but ▁due ▁to ▁climate ▁change ▁it ▁has ▁begun ▁to ▁show ▁up ▁again .   This ▁is ▁a ▁double ▁str and ed ▁DNA ▁virus ▁with ▁its ▁size ▁being ▁ 6 1 0 ▁kil ob ases ▁long . ▁The ▁gen ome ▁is ▁estimated ▁to ▁code ▁for ▁ 4 7 6 ▁open ▁reading ▁frames . ▁The ▁vir on ▁is ▁rod ▁sh aped ▁with ▁a ▁length ▁of ▁ 1 , 1 0 0   nm ▁long ▁and ▁ 5 0 0   nm ▁in ▁diameter . ▁ ▁P ox vir idae ▁The ▁P ox vir idae ▁have ▁a