| Atlantic lower abyssal rock or other hard substrata |
| Atlantic lower abyssal seabed |
| Atlantic lower bathyal coarse sediment |
| Atlantic lower bathyal mud or sandy mud to muddy sand |
| Atlantic lower bathyal rock or other hard substrata |
| Atlantic lower bathyal sand |
| Atlantic lower bathyal seabed |
| Atlantic mid abyssal rock or other hard substrata |
| Atlantic mid abyssal seabed |
| Atlantic upper abyssal coarse sediment |
| Atlantic upper abyssal mud or sandy mud to muddy sand |
| Atlantic upper abyssal rock or other hard substrata |
| Atlantic upper abyssal seabed |
| Atlantic upper bathyal coarse sediment |
| Atlantic upper bathyal mud or sandy mud to muddy sand |
| Atlantic upper bathyal rock or other hard substrata |
| Atlantic upper bathyal sand |
| Atlantic upper bathyal seabed |
| Atlanto-Mediterranean mid bathyal coarse sediment |
| Atlanto-Mediterranean mid bathyal mud or sandy mud to muddy sand |
| Atlanto-Mediterranean mid bathyal rock or other hard substrata |
| Atlanto-Mediterranean mid bathyal sand |
| Atlanto-Mediterranean mid bathyal seabed |
| Circalittoral coarse sediment |
| Circalittoral mud |
| Circalittoral rock and biogenic reef |
| Circalittoral sand |
| Circalittoral seabed |
| Deep circalittoral seabed |
| Infralittoral coarse sediment |
| Infralittoral mud |
| Infralittoral rock and biogenic reef |
| Infralittoral sand |
| Infralittoral seabed |
| Offshore circalittoral coarse sediment |
| Offshore circalittoral mud |
| Offshore circalittoral rock and biogenic reef |
| Offshore circalittoral sand |