| A1 : Littoral rock and other hard substrata |
| A2 : Littoral sediment |
| A2.3 : Littoral mud |
| 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 |
| A4.1 : Atlantic and Mediterranean high energy circalittoral rock |
| A4.2 : Atlantic and Mediterranean moderate energy circalittoral rock |
| A4.3 : Atlantic and Mediterranean low energy circalittoral rock |
| A5.13 : Infralittoral coarse sediment |
| A5.14 : Circalittoral coarse sediment |
| A5.15 : Deep circalittoral coarse sediment |
| A5.23 : Infralittoral fine sand |
| A5.24 : Infralittoral muddy sand |
| A5.25 : Circalittoral fine sand |
| A5.26 : Circalittoral muddy sand |
| A5.27 : Deep circalittoral sand |
| A5.33 : Infralittoral sandy mud |
| A5.34 : Infralittoral fine mud |
| A5.35 : Circalittoral sandy mud |
| A5.36 : Circalittoral fine mud |
| A5.37 : Deep circalittoral mud |
| A5.43 : Infralittoral mixed sediments |
| A5.44 : Circalittoral mixed sediments |
| A5.45 : Deep circalittoral mixed sediments |
| A3.13 : Mediterranean communities of infralittoral algae very exposed to wave action |
| A4.26 : Mediterranean coralligenous communities moderately exposed to hydrodynamic action |
| A4.27 : Faunal communities on deep moderate energy circalittoral rock |
| A5.13 : Infralittoral coarse sediment |
| A5.138 : Association with rhodolithes in coarse sands and fine gravels mixed by waves |
| A5.235 : Mediterranean communities of fine sands in very shallow waters |
| A5.236 : Mediterranean communities of well sorted fine sands |
| A5.24 : Infralittoral muddy sand |
| A5.28 : Mediterranean communities of superficial muddy sands in sheltered waters |
| A5.33 : Infralittoral sandy mud |
| A5.34 : Infralittoral fine mud |
| A5.38 : Mediterranean communities of muddy detritic bottoms |
| A5.39 : Mediterranean communities of coastal terrigenous muds |
| A5.46 : Mediterranean animal communities of coastal detritic bottoms |
| A5.47 : Mediterranean communities of shelf-edge detritic bottoms |
![A5.531 : [Cymodocea] beds](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEdJREFUOI1jmdnb9l9JUoiBGuDe83cMLEqSQgxOBipUMZCB4Q4DC5VMgoNRA0cNHDVw1MBRA6EG3nv+joGB4Q5VDLv3/B0DAGmXDf3+JFViAAAAAElFTkSuQmCC)
| A5.531 : [Cymodocea] beds |
![A5.535 : [Posidonia] beds](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEhJREFUOI1jmdXe9l9RWIiBGuD+23cMLIrCQgzOaipUMXDvrTsMLFQxCQmMGjhq4KiBowaOGgg18P7bdwx7b92himH3375jAAB2WxEkAfE5/gAAAABJRU5ErkJggg==)
| A5.535 : [Posidonia] beds |
| A6.2 : Deep-sea mixed substrata |
| A6.3 : Deep-sea sand |
| A6.4 : Deep-sea muddy sand |
| A6.51 : Mediterranean communities of bathyal muds |
| A6.511 : Facies of sandy muds with Thenea muricata |
![A6.513 : Facies of soft muds with [Funiculina quadrangularis] and [Apporhais seressianus]](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEJJREFUOI1jmTWp5b+SrCADNcC9x+8ZWJRkBRmcLRSpYiADAwMDC9VMGjVw1MBRA0cNHDUQ1cB7j99TzbB7j98zAACSJQxMv5wY9wAAAABJRU5ErkJggg==)
| A6.513 : Facies of soft muds with [Funiculina quadrangularis] and [Apporhais seressianus] |
![A6.514 : Facies of compact muds with [Isidella elongata]](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEdJREFUOI1j6Wmf9V9cRJGBGuDlm/sMLOIiigx6as5UMfASw14GFqqYhARGDRw1cNTAUQNHDYQa+PLNfYZLDHupYtjLN/cZAKPTD2aiuSlaAAAAAElFTkSuQmCC)
| A6.514 : Facies of compact muds with [Isidella elongata] |
| A6.52 : Communities of abyssal muds |
| A6.61 : Communities of deep-sea corals |
