Table 1 Characteristics of members of the realm Duplodnaviria
Examples	Escherichia phage T4 (AF158101), species Tequatrovirus T4; Haloferax tailed virus 1 (MG550112), species Retbasiphovirus hantatum; pseudorabies virus (JF797218), species Varicellovirus suidalpha1
Virion	Icosahedral capsids, with or without an envelope, with (bacterial and archaeal viruses) or without (eukaryotic viruses) helical tails
Genome	A single linear segment of dsDNA of 11.6–660 kbp. Reiterated sequences are common. Terminase-type DNA packaging. Modular and scattered gene organization
Replication	Rolling concatemeric, replicative transposition or protein-primed DNA replication using virus- or host-encoded enzymes. DNA-templated transcription by host- or virus-encoded RNA polymerase may be temporally co-ordinated.
Translation	Some mRNAs are spliced
Host range	Bacteria, archaea, eukaryotes
Taxonomy	The realm includes 1 kingdom, 2 phyla, 2 classes, >10 orders, >100 families, >130 subfamilies, >1700 genera and >5900 species