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Virus classification e
(unranked): Virus
Phylum: incertae sedis
Class: incertae sedis
Order: incertae sedis
Family: incertae sedis
Genus: Rhizidiovirus
Type species
Rhizidiomyces virus

Rhizidiovirus is a genus of viruses. Stramenopiles[1] (fungi and hyphochytridiomycota) serve as natural hosts. There is only one species in this genus: the type species Rhizidiomyces virus.[2][3]


Group: dsDNA



Viruses in Rhizidiovirus are non-enveloped, with icosahedral, round, and isometric geometries. The diameter is around 60 nm.[2]

The genome is non segmented, linear double stranded DNA and ~25.5 kilobases in length. It has a guanine + cytosine content of 42%. It encodes at least 14 protein with molecular weights between 84.5 and 26 kiloDaltons.

Genus Structure Symmetry Capsid Genomic arrangement Genomic segmentation
Rhizidiovirus Icosahedral Non-enveloped Linear Monopartite

Life cycle[edit]

The virus seems to remain latent within the host until the host is stressed.[4] Virons first appear in the nucleus. This is followed by the disintegration of the host nucleus and cytoplasm and their replacement by paracrystalline structures composed of virons. These structures first appear in association with the mitochondria. After the nucleus and cytoplasm have been replaced the cell wall breaks down followed with release of virons into the medium. Vertical transmission also appears to be possible.

DNA-templated transcription is the method of transcription. Fungi and hyphochytridiomycota serve as the natural host.[2]

Genus Host details Tissue tropism Entry details Release details Replication site Assembly site Transmission
Rhizidiovirus Fungi Hyphochytridiomycota None Unknown Lysis Nucleus Nucleus Passive Diffusion, Vertical


  1. ^ Dawe VH, Kuhn CW (1983) Isolation and characterization of a double-stranded DNA mycovirus infecting the aquatic fungus, Rhizidiomyces. Virology 130(1):21–28
  2. ^ a b c "Viral Zone". ExPASy. Retrieved 15 June 2015.
  3. ^ a b ICTV. "Virus Taxonomy: 2014 Release". Retrieved 15 June 2015.
  4. ^ Dawe VH, Kuhn CW (1983) Virus-like particles in the aquatic fungus, Rhizidiomyces.Virology 130(1):10–20.

External links[edit]