Order: Retrovirales (Ortervirales)
(tRNA primer, RTase, RNAse H)

• Retroviridae
  • Orthoretrovirinae
    • Alpharetrovirus
    • Betaretrovirus
    • Gammaretrovirus
    • Deltaretrovirus
      • PTLV-1
      • PTLV-2
      • PTLV-3
      • PTLV-4
      • BLV
    • Epsilonretrovirus
    • Lentivirus
      • HIV-1
      • HIV-2
  • Spumaretrovirinae
    • Simiispumavirus
    • Bovispumavirus
    • Equispumavirus
    • Felispumavirus
    • Prosimiispumavirus

• Belpaoviridae
  • Semotivirus
• Metaviridae
  • Metavirus
  • Errantivirus
• Pseudoviridae
  • Hemivirus
  • Pseudovirus
  • Sirevirus

• Caulimoviridae
  • Badnavirus
  • Caulimovirus
  • Cavemovirus
  • Dioscovirus
  • Petuvirus
  • Rosadnavirus
  • Ruflodivirus
  • Solendovirus
  • Soymovirus
  • Tungrovirus
  • Vaccinivirus

• Hepadnaviridae
  • Avihepadnavirus
  • (Herpetohepadnavirus)
  • Metahepadnavirus
  • Orthohepadnavirus
  • Parahepadnavirus

• LINE-1: Long interspersed nuclear elements-1
  • L1 type
• (LINE-2: Long interspersed nuclear elements-1)*
• (LINE-3: Long interspersed nuclear elements-1)*
  
• SINE-1: Short interspersed nuclear elements-1**
  • Alu, B1 types
  • B2 types
  
  * Genomic fossils
  ** Presumably of cellular origin

Unclassified: Retrons

• prokaryotic retrons