| Infralittoral fine mud |
| Infralittoral fine or muddy sand |
| Infralittoral sandy mud |
| Infralittoral coarse sediment |
| Infralittoral mixed sediments |
| Atlantic and Mediterranean high energy infralittoral rock |
| Atlantic and Mediterranean low energy infralittoral rock |
| Atlantic and Mediterranean moderate energy infralittoral rock |
| Circalittoral sandy mud |
| Circalittoral fine or muddy sand |
| Circalittoral coarse sediment |
| Circalittoral mixed sediments |
| Circalittoral fine mud |
| Atlantic and Mediterranean high energy circalittoral rock |
| Atlantic and Mediterranean low energy circalittoral rock |
| Atlantic and Mediterranean moderate energy circalittoral rock |
| Atlantic upper bathyal coarse sediment |
| Atlantic upper bathyal mixed substrata |
| Atlantic upper bathyal mud |
| Atlantic upper bathyal rock or other hard substrata |
| Atlantic upper bathyal sand |
| Atlantic upper bathyal sandy mud to muddy sand |
| Atlanto-Mediterranean mid bathyal coarse sediment |
| Atlanto-Mediterranean mid bathyal mud |
| Deep circalittoral mud |
| Deep circalittoral mixed sediments |
| Deep circalittoral coarse sediment |
| Deep circalittoral sand |
| Atlanto-Mediterranean mid bathyal rock or other hard substrata |
| Atlanto-Mediterranean mid bathyal sand |
| Atlanto-Mediterranean mid bathyal sandy mud to muddy sand |
| Atlanto-Mediterranean mid bathyal seabed |
| Atlantic lower bathyal seabed |
| Faunal communities on deep low energy circalittoral rock |
| Faunal communities on deep moderate energy circalittoral rock |