Genus: Socyvirus

Genus: Socyvirus

Distinguishing features

The genus Socyvirus includes a single species represented by soybean cyst nematode virus 1 (SbCNV1) (Bekal et al., 2011). Phylogenetic analysis using a conserved region of the RdRP region of L places SbCNV1 in a separate clade to the nyaviruses.


Nucleic acid

Non-segmented, negative-sense RNA genome of 11,359 nucleotides, assembled from a nematode transcriptome (Bekal et al., 2011).


Based on the genome organization, five structural proteins: nucleoprotein (N), phosphoprotein (P), matrix protein (M), glycoprotein (G) and large protein (L).

Genome organization and replication

The SbCNV1 genome contains five ORFs in anti-genomic sense in the order 3'-N–P–M–G–L-5', whereas nyaviruses genomes contain one additional ORF (IV) between the N and G coding sequences. Transcription initiation motifs upstream of the ORFs are not conserved between SbCNV1 and nyaviruses.


SbCNV1 was isolated from a plant parasitic nematode (Heterodera glycines Ichinohe, 1952).

Species demarcation criteria

Not applicable

Member species

Exemplar isolate of the species
SpeciesVirus nameIsolateAccession numberRefSeq numberAvailable sequenceVirus Abbrev.
Soybean cyst nematode socyvirusSoybean cyst nematode virus 1HM849038NC_024702Complete genomeSbCNV-1

Virus names, the choice of exemplar isolates, and virus abbreviations, are not official ICTV designations.

Derivation of names

Socyvirus: from soybean cyst nematode virus and virus. Species: named after the host.