EUNIS habitat type hierarchical view

• A : Marine habitats
  
  • A1 : Littoral rock and other hard substrata
    
  • A2 : Littoral sediment
    
  • A3 : Infralittoral rock and other hard substrata
    
  • A4 : Circalittoral rock and other hard substrata
    
    • 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
      • A4.31 : Brachiopod and ascidian communities on circalittoral rock
      • A4.32 : Mediterranean coralligenous communities sheltered from hydrodynamic action
      •  A4.33 : Faunal communities on deep low energy circalittoral rock
    •  A4.4 : Baltic exposed circalittoral rock
    •  A4.5 : Baltic moderately exposed circalittoral rock
    •  A4.6 : Baltic sheltered circalittoral rock
    • A4.7 : Features of circalittoral rock
  • A5 : Sublittoral sediment
    
    • A5.1 : Sublittoral coarse sediment
    • A5.2 : Sublittoral sand
      • A5.21 : Sublittoral sand in low or reduced salinity
      • A5.22 : Sublittoral sand in variable salinity (estuaries)
      • A5.23 : Infralittoral fine sand
      • A5.24 : Infralittoral muddy sand
      • A5.25 : Circalittoral fine sand
        •  A5.251 : [Echinocyamus pusillus], [Ophelia borealis] and [Abra prismatica] in circalittoral fine sand
        •  A5.252 : [Abra prismatica], [Bathyporeia elegans] and polychaetes in circalittoral fine sand
        •  A5.253 : Medium to very fine sand, 100-120 m, with polychaetes [Spiophanes kroyeri], [Amphipectene auricoma], [Myriochele] sp., [Aricidea wassi] and amphipods [Harpinia antennaria]
      • A5.26 : Circalittoral muddy sand
      • A5.27 : Deep circalittoral sand
      • A5.28 : Mediterranean communities of superficial muddy sands in sheltered waters
    • A5.3 : Sublittoral mud
    • A5.4 : Sublittoral mixed sediments
    • A5.5 : Sublittoral macrophyte-dominated sediment
    • A5.6 : Sublittoral biogenic reefs
    • A5.7 : Features of sublittoral sediments
      • A5.71 : Seeps and vents in sublittoral sediments
      • A5.72 : Organically-enriched or anoxic sublittoral habitats
  • A6 : Deep-sea bed
    
  • A7 : Pelagic water column
    
    • A7.1 : Neuston
    • A7.2 : Completely mixed water column with reduced salinity
    • A7.3 : Completely mixed water column with full salinity
    • A7.4 : Partially mixed water column with reduced salinity and medium or long residence time
    • A7.5 : Unstratified water column with reduced salinity
      •  A7.51 : Euphotic (epipelagic) zone in unstratified reduced salinity water
      •  A7.52 : Mesopelagic zone in unstratified reduced salinity water
      •  A7.53 : Bathypelagic zone in unstratified reduced salinity water
      •  A7.54 : Abyssopelagic zone in unstratified reduced salinity water
    • A7.6 : Vertically stratified water column with reduced salinity
    • A7.7 : Fronts in reduced salinity water column
    • A7.8 : Unstratified water column with full salinity
    • A7.9 : Vertically stratified water column with full salinity
    • A7.A : Fronts in full salinity water column
  • A8 : Ice-associated marine habitats
    
• B : Coastal habitats
  
• C : Inland surface waters
  
  • C1 : Surface standing waters
    
  • C2 : Surface running waters
    
  • C3 : Littoral zone of inland surface waterbodies
    
• D : Mires, bogs and fens
  
• E : Grasslands and lands dominated by forbs, mosses or lichens
  
  • E1 : Dry grasslands
    
  • E2 : Mesic grasslands
    
  • E3 : Seasonally wet and wet grasslands
    
  • E4 : Alpine and subalpine grasslands
    
  • E5 : Woodland fringes and clearings and tall forb stands
    
  • E6 : Inland salt steppes
    
  • E7 : Sparsely wooded grasslands
    
• F : Heathland, scrub and tundra
  
• G : Woodland, forest and other wooded land
  
• H : Inland unvegetated or sparsely vegetated habitats
  
• I : Regularly or recently cultivated agricultural, horticultural and domestic habitats
  
• J : Constructed, industrial and other artificial habitats
  
• X : Habitat complexes