| Order | Family | Genus | Species |
|---|---|---|---|
| Acrochaetiales | 1 | 7 | 51 |
| Acrosymphytales | 3 | 3 | 13 |
| Ahnfeltiales | 1 | 1 | 11 |
| Balbianiales | 1 | 2 | 2 |
| Balliales | 1 | 1 | 10 |
| Batrachospermales | 3 | 25 | 206 |
| Bonnemaisoniales | 2 | 8 | 52 |
| Ceramiales | 8 | 271 | 2275 |
| Colaconematales | 1 | 1 | 21 |
| Corallinales | 6 | 36 | 1352 |
| Corynodactylales | 1 | 1 | 1 |
| Entwisleiales | 1 | 1 | 1 |
| Gelidiales | 4 | 16 | 300 |
| Gigartinales | 40 | 196 | 1643 |
| Gracilariales | 2 | 9 | 291 |
| Halymeniales | 2 | 34 | 410 |
| Hapalidiales | 1 | 25 | 335 |
| Hildenbrandiales | 1 | 3 | 138 |
| Nemaliales | 4 | 30 | 287 |
| Nemastomatales | 2 | 7 | 84 |
| Ottiales | 1 | 2 | 2 |
| Palmariales | 4 | 12 | 67 |
| Peyssonneliales | 1 | 15 | 266 |
| Pihiellales | 1 | 1 | 1 |
| Plocamiales | 2 | 4 | 125 |
| Rhodachlyales | 1 | 1 | 4 |
| Rhodogorgonales | 1 | 3 | 11 |
| Rhodymeniales | 6 | 54 | 463 |
| Sebdeniales | 1 | 4 | 35 |
| Sporolithales | 1 | 3 | 67 |
| Thoreales | 1 | 2 | 25 |