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Riboviria
Ribozyviria/viroid
image Realm: 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 .

The realm is called Adnaviria, which refers to the double-helical structures of the A-form that have been adapted from the viral genomes in the nucleocapsids.

Kingdom: Zilligvirae Phylum: Taleaviricota

Class: Tokiviricetes No polymerase, major capsid with SIRV2-type fold
Order: Ligamenvirales
Order: Maximonvirales
Order: Primavirales

capsid of solfataricus rod-shaped virus (SSRV1), encapsidating A-form DNA