| human endogenous retrovirus | species | viruses and viroids | viruses | species | 11827 |
| primate t-lymphotropic virus 1 | species | viruses and viroids | viruses | species | 194440 |
| rous sarcoma virus | species | viruses and viroids | viruses | species | 11886 |
| simian foamy virus | species | viruses and viroids | viruses | species | 11642 |
| simian immunodeficiency virus | species | viruses and viroids | viruses | species | 11723 |
| simian retrovirus 4 | species | viruses and viroids | viruses | species | 723802 |
| simian retrovirus 5 | species | viruses and viroids | viruses | species | 123561 |
| simian retrovirus y | species | | | species | 980635 |
| simian t-lymphotropic virus 1 | no rank | viruses and viroids | viruses | no rank | 33747 |
| simian t-lymphotropic virus 3 | no rank | viruses and viroids | viruses | no rank | 39101 |