Portogloboviridae is a family of dsDNA viruses that infect archaea. It is a proposed family of the realm Varidnaviria, but ICTV officially puts it as incertae sedis virus. Viruses in the family are related to Helvetiavirae. The capsid proteins of these viruses and their characteristics are of evolutionary importance for the origin of the other Varidnaviria viruses since they seem to retain primordial characters.