Low-resolution image of a marnavirus under electron microscope
Virus classification
Group: Group IV ((+)ssRNA)
Order: Picornavirales
Family: Marnaviridae
  • Marnavirus

Marnaviridae is a family of RNA viruses in the order Picornavirales. Seaweed[1] and Heterosigma akashiwo algae[2] serve as natural hosts. There is only one genus (Marnavirus) and one species in this family: the type species Heterosigma akashiwo RNA virus (HaRNAV).[3]


Group: ssRNA(+)



Viruses in Marnaviridae are non-enveloped, with icosahedral geometries, and T=pseudo3 symmetry. The diameter is around 25 nm. Genomes are linear and non-segmented, around 8.6kb in length.[1]

Genus Structure Symmetry Capsid Genomic Arrangement Genomic Segmentation
MarnavirusIcosahedralPseudo T=3Non-EnvelopedLinearMonopartite

Life cycle

Entry into the host cell is achieved by penetration into the host cell. Replication follows the positive stranded RNA virus replication model. Positive stranded RNA virus transcription is the method of transcription. The virus exits the host cell by tubule-guided viral movement.

Seaweed serves as the natural host.[1]

Genus Host Details Tissue Tropism Entry Details Release Details Replication Site Assembly Site Transmission
MarnavirusSeaweedNoneCell receptor endocytosisUnknownCytoplasmCytoplasmPassive diffusion


  1. 1 2 3 "Viral Zone". ExPASy. Retrieved 15 June 2015.
  2. Lang, A. S.; Culley, A. I.; Suttle, C. A. (2004). "Genome sequence and characterization of a virus (HaRNAV) related to picorna-like viruses that infects the marine toxic bloom-forming alga Heterosigma akashiwo". Virology. 320 (2): 206–17. doi:10.1016/j.virol.2003.10.015. PMID 15016544.
  3. 1 2 ICTV. "Virus Taxonomy: 2014 Release". Retrieved 15 June 2015.
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