| A (2 species) |
| Arandaspis - 480-470 Ma Early Ordovician |
| Astraspis - 467-443 Ma middle-late Ordovician |
| B (0 species) |
| C (0 species) |
| D (0 species) |
| E (0 species) |
| F (0 species) |
| G (0 species) |
| H (0 species) |
| I (0 species) |
| J (0 species) |
| K (0 species) |
| L (0 species) |
| M (0 species) |
| N (0 species) |
| O (0 species) |
| P (0 species) |
| Q (0 species) |
| R (0 species) |
| S (1 species) |
| Sacabambaspis - Dapingian-Sandbian, 470-455 Ma |
| T (0 species) |
| U (0 species) |
| V (0 species) |
| W (0 species) |
| X (0 species) |
| Y (0 species) |
| Z (0 species) |