Family: Madisaviridae (interim)

This is a summary page created by the ICTV Report Editors using information from associated Taxonomic Proposals and the Master Species List.

Edited by: Mart Krupovic
Posted: April 2023


The family Madisaviridae includes lytic double-stranded DNA viruses that infect the hyperhalophilic archaeon Haloarcula hispanica (Table 1.Madisaviridae). The family Madisaviridae was established in 2022 (Master Species List 37).

Table 1.Madisaviridae. Characteristics of members of the family Madisaviridae.




Haloarcula hispanica tailed virus 1 (KC292025), species Clampvirus HHTV1, genus Clampvirus


Icosahedral capsid and a non-contractile helical tail (siphoviral morphology)


Linear, dsDNA genome of 49 kbp, circularly permuted

Host range

hyperhalophilic archaea of the species Haloarcula hispanica


Realm Duplodnaviria, kingdom Heunggongvirae, phylum Uroviricota, class Caudoviricetes: 1 genus and 1 species

Madisaviridae genome

Figure 1.Madisaviridae. Genome organisation of Haloarcula hispanica tailed virus 1, a member of the family Madisaviridae. Boxes indicate open reading frames as annotated on GenBank accession KC292025.

Madisaviridae taxonomy

Figure 2.Madisaviridae. Relationships of the taxa connected to the family Madisaviridae.

Derivation of name

Madisaviridae: truncation of Margherita di Savoia – the place of virus isolation.