ovaliviridae ovaliviridae ovaliviridae is a family of viruses of archaea that is not assigned to any higher taxonomic ranks. the family contains a single genus, alphaovalivirus, which contains a single species, sulfolobus ellipsoid virus 1. the linear genome of dsdna is 23,219 bp with 172 bp inverted terminal repeats. sulfolobus ellipsoid virus 1 was isolated from an acidic hot spring (86−106oc, ph 2.2−2.5) in laguna fumarólica, costa rica; the only known host is sulfolobus sp. a20. ovaliviridae virus classification (unranked): virus realm: incertae sedis kingdom: incertae sedis phylum: incertae sedis class: incertae sedis order: incertae sedis family: ovaliviridae subtaxa genus: alphaovalivirus species: sulfolobus ellipsoid virus 1