| Class I | Class II | Class III |
|---|---|---|
| Group 1: HERV-HF | Group 1: HML-1 | HERV-L |
| HERV-H (RTVL-H, RGH) HERV-F | HERV-K (HML-1.1) | |
| Group 2: HERV-RW | Group 2: HML-2 | HERV-S |
| HERV-W HERV-R (ERV9) | HERV-K10 | (HERV18) |
| HERV-P (HuERS-P, HuRRS-P) | HERV-K-HTDV | |
| Group 3: HERV-ER1 | Group 3: HML-3 | HERV-U |
| HERV-E (4–1, ERVA, NP-2) | HERV-K (HML3.1) | |
| 51–1 HERV-R (ERV3) RRHERV-1 | ||
| Group 4 : HERV-T | Group 4: HML-4 | HERV-U3 |
| HERV-T (S71, CRTK1, CRTK6) | HERV-K-T47D | |
| Group 5: HERV-IP | Group 5: HML-5 | |
| HERV-I (RTVL-I) | HERV-K-NMWV2 | |
| HERV-IP-T47D (ERV-FTD) | ||
| Group 6: HERV-FRD | Group 6: HML-6 | |
| ERV-FRD | HERV-K (HML-6p) | |
| Other: HRES-1 | Group 7: HML-7 | |
| HERV-K-NMWV7 | ||
| Group 8: HML-8 | ||
| HERV-K-NMWV3 | ||
| Group 9: HML-9 | ||
| HERV-K-NMWV9 | ||
| Group 10: HML-10 | ||
| HERV-KC4 | ||