Riboviria

Viruses from this realm are RNA virus encoding for an homologous RNA dependent polymerase. It comprises RNA viruses and reverse transcribing viruses. Seven different phyla are classified based on their polymerase homologies.

Duplodnaviria

Viruses from this realm are viruses with linear double-stranded DNA genomes and characteristic major capsid proteins with HK97-like folding . The capsids are icosahedral with T=3 to T=16 symmetry, with a portal at one vertex to which a short or long tail is attached.

Adnaviria

Viruses from this realm are archaeal filamentous viruses with linear A-form double-stranded DNA genomes and characteristic major capsid proteins with SIRV2-like folding, which have nothing to do with those of other known viruses .

Varidnaviria

Double-stranded DNA viruses of the realm Varidnaviria are characterized by homologous major capsid proteins (MCPs) containing two β-barrel domains (kingdom: Bamfordvirae) known as the jelly roll folds . Most capsids are icosahedral with T=21 to T=972-1200 symmetry.

Monodnaviria

Viruses from this realm are viruses with circular single-stranded DNA genomes and most of them encode a rolling circle replication initiation endonuclease (Rep). The capsids are either helical or icosahedral with T=1 symmetry (single jelly roll (SJR)).

Artverviricota

Viruses from this phylum are viruses using reverse transcription, and are characterized by the reverse-transcriptase (PFAM RTase_1). The capsids belongs to retrotranscribing-like lineage and are icosahedral with T=3 to T=7 symmetry or pseudo-icosahedral.

Duplornaviricota

RNA viruses of the phylum Duplornaviricota are characterized by homologous RNA-dependent-RNA polymerases (PFAM RdRp_4 or PFAM RdRp_5 families). These viruses have linear double-stranded RNA genomes and characteristic major capsid proteins with BTV-like folding . The capsids are icosahedral with a symmetry of T=1 to T=13.

Kitrinoviricota

Single-stranded RNA viruses of the Kitrinoviricota phylum are characterized by a homologous RNA-dependent RNA polymerase (Pfam RdRP_2 or RdRP_3 families). Their capsid are either icosahedral (T=1, 3 or 4) or helical.

Pisuviricota

RNA viruses of the phylum Pisuviricota are characterized by homologous RNA-dependent-RNA polymerases (Pfam RdRp_1 family). Most capsids are icosahedral with T=1 to T=4 symmetry.

Lenarviricota

The viruses of this phylum are characterized by a homologous RNA-dependent RNA polymerase of the lenar type (PFAM Levi family and PFAM Mitovirus family). Some viruses do not encode a capsid, others form virions with an icosahedral capsid of T=3 symmetry.

Circular ssRNA viruses

These viruses and viroids are characterized by a circular single stranded RNA genome, encoding for ribozymes but no capsids. It comprises viruses (Ribozyviria realm, Ambiviricota phylum from riboviria), viroids, retroviroid and obelisk.

Negarnaviricota

The viruses of this phylum have linear, negative-stranded RNA genomes and a characteristic RNA dependent RNA polymerase of the monopartite genome type (Haploviricotina) or segmented genomes (Polyploviricotina). The capsids are helical and package the negative-stranded RNA genome.