EUNIS habitat type hierarchical view

• A : Marine habitats
  
  • A1 : Littoral rock and other hard substrata
    
    • A1.1 : High energy littoral rock
    • A1.2 : Moderate energy littoral rock
    • A1.3 : Low energy littoral rock
      • A1.31 : Fucoids on sheltered marine shores
      • A1.32 : Fucoids in variable salinity
        •  A1.321 : [Pelvetia canaliculata] on sheltered variable salinity littoral fringe rock
        •  A1.322 : [Fucus spiralis] on sheltered variable salinity upper eulittoral rock
        •  A1.323 : [Fucus vesiculosus] on variable salinity mid eulittoral boulders and stable mixed substrata
        •  A1.324 : [Ascophyllum nodosum] and [Fucus vesiculosus] on variable salinity mid eulittoral rock
        •  A1.325 : [Ascophyllum nodosum] ecad. [mackaii] beds on extremely sheltered mid eulittoral mixed substrata
        •  A1.326 : [Fucus serratus] and large [Mytilus edulis] on variable salinity lower eulittoral rock
        •  A1.327 : [Fucus ceranoides] on reduced salinity eulittoral rock
      •  A1.33 : Red algal turf in lower eulittoral, sheltered from wave action
      • A1.34 : Mediterranean communities of lower mediolittoral rock sheltered from wave action
    • A1.4 : Features of littoral rock
  • A2 : Littoral sediment
    
  • A3 : Infralittoral rock and other hard substrata
    
  • A4 : Circalittoral rock and other hard substrata
    
  • A5 : Sublittoral sediment
    
    • A5.1 : Sublittoral coarse sediment
    • A5.2 : Sublittoral sand
    • A5.3 : Sublittoral mud
    • A5.4 : Sublittoral mixed sediments
      • A5.41 : Sublittoral mixed sediment in low or reduced salinity
      • A5.42 : Sublittoral mixed sediment in variable salinity (estuaries)
      • A5.43 : Infralittoral mixed sediments
      • A5.44 : Circalittoral mixed sediments
      • A5.45 : Deep circalittoral mixed sediments
      • A5.46 : Mediterranean animal communities of coastal detritic bottoms
      • A5.47 : Mediterranean communities of shelf-edge detritic bottoms
    • A5.5 : Sublittoral macrophyte-dominated sediment
    • A5.6 : Sublittoral biogenic reefs
    • A5.7 : Features of sublittoral sediments
  • 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
    
    • A8.1 : Sea ice
    • A8.2 : Freshwater ice
      •  A8.21 : Large tabular iceberg
      •  A8.22 : Medium iceberg
      •  A8.23 : Small iceberg
      •  A8.24 : Bergy bit
      •  A8.25 : Growler
    • A8.3 : Brine channels
    • A8.4 : Under-ice habitat
• B : Coastal habitats
  
• C : Inland surface waters
  
  • C1 : Surface standing waters
    
  • C2 : Surface running waters
    
  • C3 : Littoral zone of inland surface waterbodies
    
    • C3.1 : Species-rich helophyte beds
    • C3.2 : Water-fringing reedbeds and tall helophytes other than canes
    • C3.3 : Water-fringing beds of tall canes
    • C3.4 : Species-poor beds of low-growing water-fringing or amphibious vegetation
    • C3.5 : Periodically inundated shores with pioneer and ephemeral vegetation
    • C3.6 : Unvegetated or sparsely vegetated shores with soft or mobile sediments
    • C3.7 : Unvegetated or sparsely vegetated shores with non-mobile substrates
    •  C3.8 : Inland spray- and steam-dependent habitats
• D : Mires, bogs and fens
  
• E : Grasslands and lands dominated by forbs, mosses or lichens
  
• 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