| A3.1: Atlantic and mediterranean high energy infralittoral rock |
| A3.2: Atlantic and mediterranean moderate energy infralittoral rock |
| A3.3: Atlantic and mediterranean low energy infralittoral rock |
| A3.4: Baltic exposed infralittoral rock |
| A3.5: Baltic moderately exposed infralittoral rock |
| A3.6: Baltic sheltered infralittoral rock |
| A3: Infralittoral rock and other hard substrata |
| A4.12 or A4.27 or A4.33: Sponge communities on deep circalittoral rock or faunal communities on deep moderate energy circalittoral rock or faunal communities on deep low energy circalittoral rock |
| A4.12: Sponge communities on deep circalittoral rock |
| A4.1: Atlantic and mediterranean high energy circalittoral rock |
| A4.26 or A4.32: Mediterranean coralligenous communities moderately exposed to or sheltered from hydrodynamic action |
| A4.27: Faunal communities on deep moderate energy circalittoral rock |
| A4.2: Atlantic and mediterranean moderate energy circalittoral rock |
| A4.33: Faunal communities on deep low energy circalittoral rock |
| A4.3: Atlantic and mediterranean low energy circalittoral rock |
| A4.4: Baltic exposed circalittoral rock |
| A4.5: Baltic moderately exposed circalittoral rock |
| A4.6: Baltic sheltered circalittoral rock |
| A4: Circalittoral rock and other hard substrata |
| A5.13: Infralittoral coarse sediment |
| A5.14: Circalittoral coarse sediment |
| A5.15: Deep circalittoral coarse sediment |
| A5.23 or A5.24: Infralittoral fine sand or infralittoral muddy sand |
| A5.23 or A5.24: Infralittoral sand or infralittoral muddy sand |
| A5.23: Infralittoral fine sands |
| A5.25 or A5.26: Circalittoral fine sand or circalittoral muddy sand |
| A5.25: Circalittoral fine sand |
| A5.26: Circalittoral muddy sand |
| A5.27: Deep circalittoral sand |
| A5.33 : Infralittoral sandy mud |
| A5.33 or A5.34: Infralittoral sandy mud or infralittoral fine mud |
| A5.33: Infralittoral sandy mud |
| A5.34: Infralittoral fine mud |
| A5.35 : Circalittoral sandy mud |
| A5.35 or A5.36: Circalittoral sandy mud or circalittoral fine mud |
| A5.35: Circalittoral sandy mud |
| A5.36: Circalittoral fine mud |
| A5.37: Deep circalittoral mud |
| A5.38: Mediterranean biocoenosis of muddy detritic bottoms |
| A5.39: Mediterranean biocoenosis of coastal terrigenous muds |
| A5.43: Infralittoral mixed sediment |
| A5.43: Infralittoral mixed sediments |
| A5.44: Circalittoral mixed sediment |
| A5.44: Circalittoral mixed sediments |
| A5.45: Deep circalittoral mixed sediment |
| A5.45: Deep circalittoral mixed sediments |
| A5.46: Mediterranean biocoenosis of coastal detritic bottoms |
| A5.47: Mediterranean communities of shelf-edge detritic bottoms |
| A5.531: Cymodocea beds |
![A5.531: [Cymodocea] beds](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAPklEQVQ4jWPJy8trYKAiYAER9WfWUMWwRpMQiIHUBCyjBlIMWCg3AhWMGkg5YKGCGShg1MARE4aNJiFUMxEAWdoGJDzYvhIAAAAASUVORK5CYII=)
| A5.531: [Cymodocea] beds |
![A5.5353: Facies of dead "mattes" of [Posidonia oceanica] without much epiflora](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAPklEQVQ4jWPJy8trYKAiYAERqYV8VDFsdv8niIHUBCyjBlIMWCg3AhWMGkg5YKGCGShg1MARE4az+z9RzUQAXI8HN8fKvawAAAAASUVORK5CYII=)
| A5.5353: Facies of dead "mattes" of [Posidonia oceanica] without much epiflora |
![A5.535: [Posidonia] beds](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAPklEQVQ4jWPJy8trYKAiYAERx1RDqWKY1e3VEAOpCVhGDaQYsFBuBCoYNZBywEIFM1DAqIEjJgytbq+mmokAW2EG2wm6ztkAAAAASUVORK5CYII=)
| A5.535: [Posidonia] beds |
| A6.11: Deep-sea rock |
| A6.1: Deep-sea rock and artificial hard substrata |
| A6.2: Deep-sea mixed substrata |
| A6.3: Deep-sea sand |
| A6.4 or A6.5: Deep-sea muddy sand or Deep-sea mud |
| A6.4: Deep-sea muddy sand |
| A6.511: Facies of sandy muds with Thenea muricata |
| A6.51: Mediterranean communities of bathyal muds |
| A6.52: Communities of abyssal muds |
| A6.5: Deep-sea mud |
| A6: Deep-sea bed |
| Na |