| Family | Genus | Species |
|---|---|---|
| Acanthochiasmidae | 5 | 8 |
| Acanthometridae | 3 | 11 |
| Acanthoplegmidae | 1 | 3 |
| Amphilithiidae | 1 | 4 |
| Astrolithidae | 1 | 2 |
| Diploconidae | 1 | 1 |
| Dorataspididae | 5 | 7 |
| Gigartacontidae | 2 | 4 |
| Hexalaspididae | 2 | 2 |
| Lithopteridae | 1 | 3 |
| Phyllostauridae | 6 | 16 |
| Pseudolithiidae | 1 | 1 |
| Stauraconidae | 2 | 4 |