| Parent | Category | Figures | |
|---|---|---|---|
| 1 | Flat-backed Millipedes | Xystodesmidae | 2689 |
| 2 | Flat-backed Millipedes | Paradoxosomatidae | 1989 |
| 3 | Flat-backed Millipedes | Polydesmidae | 743 |
| 4 | Flat-backed Millipedes | Euryuridae | 184 |
| 5 | Flat-backed Millipedes | Eurymerodesmidae | 119 |
| 6 | Flat-backed Millipedes | Pyrgodesmidae | 58 |
| 7 | Flat-backed Millipedes | Nearctodesmidae | 33 |
| 8 | Flat-backed Millipedes | Macrosternodesmidae | 31 |
| 9 | Flat-backed Millipedes | Sphaeriodesmidae | 5 |
| 10 | Flat-backed Millipedes | [Polydesmida] | 1 |