the root (no rank)
Viruses (domain)
retroid viruses (subkingdom)
Retroviridae (family)
Orthoretrovirinae (subfamily)
Lentivirus (genus)
simian-human immunodeficiency virus (species)
simian-Human immunodeficiency virus (alias)
[hide inferior taxa]
simian-human immunodeficiency virus 4 (subspecies)