Family: Kolmioviridae

Genus: Deevirus


Distinguishing features

Ray-finned fish virus 1 (RfFV1; previously referred to as fHDV) is the only classified deevirus. Deeviruses infect fish (Chang et al., 2019).


Virions are unknown.

Nucleic acid

Deeviruses have non-segmented, covalently closed, circular negative-sense RNA (cccRNA) genomes of about 1.6 kb with 46.3% GC content (Chang et al., 2019).


Deeviruses are predicted to express one delta antigen (DAg)-like protein of 180 amino-acid residues (Chang et al., 2019).


RfFV1 was discovered in a pool of actinopterygian, agnathian, and chondrichthyan fish sampled in China (Chang et al., 2019).

Species demarcation criteria

The genus currently only includes a single species.