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
    
    • 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
    • A3.7 : Features of infralittoral rock
  • A4 : Circalittoral rock and other hard substrata
    
  • A5 : Sublittoral sediment
    
  • A6 : Deep-sea bed
    
    • A6.1 : Deep-sea rock and artificial hard substrata
    • A6.2 : Deep-sea mixed substrata
    • A6.3 : Deep-sea sand
    •  A6.4 : Deep-sea muddy sand
    • A6.5 : Deep-sea mud
    • A6.6 : Deep-sea bioherms
    • A6.7 : Raised features of the deep-sea bed
    • A6.8 : Deep-sea trenches and canyons, channels, slope failures and slumps on the continental slope
    • A6.9 : Vents, seeps, hypoxic and anoxic habitats of the deep sea
      • A6.91 : Deep-sea reducing habitats
      •  A6.92 : Deep-sea bed influenced by hypoxic water column
      •  A6.93 : Isolated ‘oceanic’ features influenced by hypoxic water column
      • A6.94 : Vents in the deep sea
      •  A6.95 : Pontic anoxic H2S black muds of the slope and abyssal plain, with anaerobic sulphate reducing bacteria and nematodes
  • A7 : Pelagic water column
    
    • A7.1 : Neuston
      •  A7.11 : Temporary neuston layer
      •  A7.12 : Permanent neuston layer
    • 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
    • A7.6 : 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
  
• F : Heathland, scrub and tundra
  
• G : Woodland, forest and other wooded land
  
  • G1 : Broadleaved deciduous woodland
    
    • G1.1 : Riparian and gallery woodland, with dominant [Alnus], [Betula], [Populus] or [Salix]
    • G1.2 : Mixed riparian floodplain and gallery woodland
    • G1.3 : Mediterranean riparian woodland
    • G1.4 : Broadleaved swamp woodland not on acid peat
    • G1.5 : Broadleaved swamp woodland on acid peat
    • G1.6 : [Fagus] woodland
      • G1.61 : Medio-European acidophilous [Fagus] forests
      • G1.62 : Atlantic acidophilous [Fagus] forests
      • G1.63 : Medio-European neutrophile [Fagus] forests
      • G1.64 : Pyreneo-Cantabrian neutrophile [Fagus] forests
      •  G1.65 : Medio-European subalpine [Fagus] woods
      • G1.66 : Medio-European limestone [Fagus] forests
      • G1.67 : Southern medio-European [Fagus] forests
      • G1.68 : Southern Italian [Fagus] forests
      • G1.69 : Moesian [Fagus] forests
      • G1.6A : Hellenic [Fagus] forests
      •  G1.6B : Mediterraneo-Moesian [Fagus] forests
      • G1.6C : Illyrian [Fagus] forests
      • G1.6D : Dacian [Fagus] forests
      • G1.6E : Pontic [Fagus] forests
      •  G1.6F : Dobrogea [Fagus] forest
      •  G1.6G : Crimean [Fagus] forests
      •  G1.6H : Caucasian [Fagus] forests
      •  G1.6I : Caspian [Fagus] forests
      •  G1.6J : Eastern oro-Mediterranean [Fagus] forests
    • G1.7 : Thermophilous deciduous woodland
    • G1.8 : Acidophilous [Quercus]-dominated woodland
    • G1.9 : Non-riverine woodland with [Betula], [Populus tremula] or [Sorbus aucuparia]
    • G1.A : Meso- and eutrophic [Quercus], [Carpinus], [Fraxinus], [Acer], [Tilia], [Ulmus] and related woodland
    • G1.B : Non-riverine [Alnus] woodland
    • G1.C : Highly artificial broadleaved deciduous forestry plantations
    • G1.D : Fruit and nut tree orchards
  • G2 : Broadleaved evergreen woodland
    
    • G2.1 : Mediterranean evergreen [Quercus] woodland
      • G2.11 : [Quercus suber] woodland
      • G2.12 : [Quercus ilex] woodland
      • G2.13 : [Quercus coccifera] and [Quercus alnifolia] woodland
    • G2.2 : Eurasian continental sclerophyllous woodland
    • G2.3 : Macaronesian [Laurus] woodland
    • G2.4 : [Olea europaea] - [Ceratonia siliqua] woodland
    • G2.5 : [Phoenix] groves
    •  G2.6 : [Ilex aquifolium] woods
    • G2.7 : Canary Island heath woodland
    • G2.8 : Highly artificial broadleaved evergreen forestry plantations
    • G2.9 : Evergreen orchards and groves
  • G3 : Coniferous woodland
    
  • G4 : Mixed deciduous and coniferous woodland
    
    •  G4.1 : Mixed swamp woodland
    •  G4.2 : Mixed taiga woodland with [Betula]
    • G4.3 : Mixed sub-taiga woodland with acidophilous [Quercus]
    •  G4.4 : Mixed [Pinus sylvestris] - [Betula] woodland
    •  G4.5 : Mixed [Pinus sylvestris] - [Fagus] woodland
    •  G4.6 : Mixed [Abies] - [Picea] - [Fagus] woodland
    • G4.7 : Mixed [Pinus sylvestris] - acidophilous [Quercus] woodland
    •  G4.8 : Mixed non-riverine deciduous and coniferous woodland
    •  G4.9 : Mixed deciduous woodland with [Cupressaceae] or [Taxaceae]
    •  G4.A : Mixed woodland with [Cupressaceae], [Taxaceae] and evergreen oak
    •  G4.B : Mixed mediterranean [Pinus] - thermophilous [Quercus] woodland
    •  G4.C : Mixed [Pinus sylvestris] - thermophilous [Quercus] woodland
    •  G4.D : Mixed [Pinus nigra] - evergreen [Quercus] woodland
    •  G4.E : Mixed mediterranean pine - evergreen oak woodland
    •  G4.F : Mixed forestry plantations
  • G5 : Lines of trees, small anthropogenic woodlands, recently felled woodland, early-stage woodland and coppice
    
• H : Inland unvegetated or sparsely vegetated habitats
  
  • H1 : Terrestrial underground caves, cave systems, passages and waterbodies
    
  • H2 : Screes
    
  • H3 : Inland cliffs, rock pavements and outcrops
    
    • H3.1 : Acid siliceous inland cliffs
    • H3.2 : Basic and ultra-basic inland cliffs
    •  H3.3 : Macaronesian inland cliffs
    • H3.4 : Wet inland cliffs
    • H3.5 : Almost bare rock pavements, including limestone pavements
    • H3.6 : Weathered rock and outcrop habitats
  • H4 : Snow or ice-dominated habitats
    
  • H5 : Miscellaneous inland habitats with very sparse or no vegetation
    
  • H6 : Recent volcanic features
    
• I : Regularly or recently cultivated agricultural, horticultural and domestic habitats
  
  • I1 : Arable land and market gardens
    
  • I2 : Cultivated areas of gardens and parks
    
• J : Constructed, industrial and other artificial habitats
  
• X : Habitat complexes