|Group:||Group IV ((+)ssRNA)|
The genome of these viruses is unipartate and between 2.3 and 3.5 kilobases in length. It encodes a single gene—the RNA dependent RNA polymerase. This protein is associated with the genome in the cytoplasm of the host. The viruses do not have a capsid or envelop and do not form any infectious viral particles except lipid vesicles.
Two genera have been recognised to date. The Mitoviruses infect the mitochondria of fungi while the Narnaviruses remain within the cytoplasm of the host.
- Genus Narnavirus; type species: Saccharomyces cerevisiae 20SRNA narnavirus
- Genus Mitovirus; type species: Cryphonectria parasitica mitovirus-1 NB631
Their closest relatives among RNA viruses are plant-infecting viruses of genus Ourmiavirus, which, however, have a capsid and a number of other proteins. Other colse relatives are bacteriophages of the family Leviviridae.
- Dolja, V. V.; Koonin, E. V. (2012). "Capsid-Less RNA Viruses". ELS. doi:10.1002/9780470015902.a0023269. ISBN 0470016175.
- Solorzano A, Rodríguez-Cousiño N, Esteban R, Fujimura T (2000) Persistent yeast single-stranded RNA viruses exist in vivo as genomic RNA. RNA polymerase complexes in 1:1 stoichiometry. J Biol Chem 275(34):26428–35
- Hillman, B. I.; Cai, G. (2013). "The Family Narnaviridae". Mycoviruses. Advances in Virus Research 86. p. 149. doi:10.1016/B978-0-12-394315-6.00006-4. ISBN 9780123943156.
- Cai G, Myers K, Fry WE, Hillman BI (2011) A member of the virus family Narnaviridae from the plant pathogenic oomycete Phytophthora infestans. Arch Virol
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