Genus: Simiispumavirus
Subfamily: Spumaretrovirinae
Genus: Simiispumavirus
Genus: Prosimiispumavirus
Subfamily: Spumaretrovirinae
Genus: Prosimiispumavirus
Genus: Felispumavirus
Subfamily: Spumaretrovirinae
Genus: Felispumavirus
Distinguishing features
Viruses of the genus occur naturally in feline hosts.
Virion
See discussion in subfamily description.
Genus: Equispumavirus
Subfamily: Spumaretrovirinae
Genus: Equispumavirus
Distinguishing features
Viruses of the genus occur naturally in equine hosts.
Virion
See discussion in subfamily description.
Genus: Bovispumavirus
Subfamily: Spumaretrovirinae
Genus: Bovispumavirus
Distinguishing features
Viruses classified as members of the genus colonize bovine hosts.
Virion
See discussion in subfamily description.
Subfamily: Spumaretrovirinae
Family: Retroviridae
Subfamily: Spumaretrovirinae
Genus: Lentivirus
Subfamily: Orthoretrovirinae
Genus: Lentivirus
Genus: Gammaretrovirus
Subfamily: Orthoretrovirinae
Genus: Gammaretrovirus
Genus: Epsilonretrovirus
Subfamily: Orthoretrovirinae
Genus: Epsilonretrovirus
Genus: Deltaretrovirus
Subfamily: Orthoretrovirinae
Genus: Deltaretrovirus
Distinguishing features
Viruses in this genus are most similar to viruses in the genus Gammaretrovirus, but can be distinguished based on RT-based phylogenetic clustering, by the presence of the regulatory genes tax and rex, and in some viruses, the unusual presence of an hbz gene on the antisense strand.