Genus Betacryptovirus

Type Species	White clover cryptic virus 2	(WCCV-2)

Virion Properties

Morphology

Virions are isometric, 38  nm in diameter. Particles show prominent subunits, but their precise geometrical arrangement is not clear. The particles are rounded and are not penetrated by stain (Fig. 5).

Physicochemical and Physical Properties

Virion buoyant density in CsCl is 1.375  g/cm³.

Nucleic Acid

Viral nucleic acid comprises two dsRNA segments, which are about 2.1 and 2.25  kbp in size.

Proteins

Not characterized.

Lipids

None reported.

Carbohydrates

None reported.

Antigenic Properties

Some viruses in the genus are serologically related; none are related to viruses in the genus Alphacryptovirus.

List of Species Demarcation Criteria in the Genus

The criteria to differentiate species in the genus are:

	host range,
	size of dsRNA segments, and
	serological relationships.

Species in the genus are not serologically related or distantly related (serological differentiation index of 5 or greater). Electrophoretic profiles of the genomic RNAs are distinct.

List of Species in the Genus

Official virus species names are in italics. Tentative virus species names, alternative names ( ), strains or serotypes are not italicized. Virus names and assigned abbreviations ( ) are:

Species in the Genus

Carrot temperate virus 2	(CTeV-2)
Hop trefoil cryptic virus 2	(HTCV-2)
Red clover cryptic virus 2	(RCCV-2)
White clover cryptic virus 2	(WCCV-2)

Tentative Species in the Genus

Alfalfa cryptic virus 2	(ACV-2)

List of Unassigned Viruses in the Family

None reported.

Similarity with Other Taxa

None reported.

Derivation of Names

Crypto: from Greek crypto, “hidden, covered, or secret”.

Partiti: from Latin partitius, “divided”.