Notes on Family: Quadriviridae



General Description

Viruses in this family have spherical particles slightly larger than those of partitiviruses and chrysoviruse and four dsRNA segments (hence the name). Phylogenetic analysis shows that quadriviruses form a separate group of mycoviruses and that the polymerase has a distant relationship with that of viruses in the family Chrysoviridae.


Virions are icosahedral and about 48 nm in diameter.


Quadripartite, linear double-stranded RNA, with segments ranging in size from 3.7 to 4.9 kbp and each encoding a single polypeptide. A terminal sequence of seven 5’- and fourteen 3’-nucleotides is strictly conserved in all segments.

Genera in the Family

There is currently only one genus: