EUNIS habitat type hierarchical view (marine version 2022 & terrestrial version 2021)

The EUNIS habitat classification review is on-going. Four groups are pending review: Inland waters, Wetlands, Constructed, industrial and other artificial habitats and Complexes.

• M : Marine benthic habitats (MA-MG)
  
• MH : Pelagic water column
  
  • MH1 : Neuston
    
    • MH11 : Arctic neuston
      
      • MH111 : Arctic temporary neuston layer
        
      • MH112 : Arctic permanent neuston layer
        
    • MH12 : Atlantic neuston
      
    • MH13 : Baltic neuston
      
    • MH14 : Black Sea neuston
      
    • MH15 : Mediterranean neuston
      
  • MH2 : Completely mixed water column with reduced salinity
    
  • MH3 : Completely mixed water column with full salinity
    
  • MH4 : Partially mixed water column with reduced salinity and medium or long residence time
    
  • MH5 : Unstratified water column with reduced salinity
    
  • MH6 : Vertically stratified water column with reduced salinity
    
  • MH7 : Fronts in reduced salinity water column
    
  • MH8 : Unstratified water column with full salinity
    
    • MH81 : Arctic unstratified water column with full salinity
      
      • MH811 : Arctic euphotic (epipelagic) zone in unstratified full salinity water
        
      • MH812 : Arctic mesopelagic zone in unstratified full salinity water
        
      • MH813 : Arctic bathypelagic zone in unstratified full salinity water
        
      • MH814 : Arctic abyssopelagic zone in unstratified full salinity water
        
    • MH82 : Atlantic unstratified water column with full salinity
      
    • MH83 : Baltic unstratified water column with full salinity
      
    • MH84 : Black Sea unstratified water column with full salinity
      
      • MH841 : Black Sea euphotic (epipelagic) zone in unstratified full salinity water
        
      • MH842 : Black Sea mesopelagic zone in unstratified full salinity water
        
      • MH843 : Black Sea bathypelagic zone in unstratified full salinity water
        
      • MH844 : Black Sea abyssopelagic zone in unstratified full salinity water
        
    • MH85 : Mediterranean unstratified water column with full salinity
      
  • MH9 : Vertically stratified water column with full salinity
    
  • MHA : Fronts in full salinity water column
    
• MJ : Ice-associated marine habitats
  
  • MJ1 : Sea ice
    
  • MJ2 : Freshwater ice
    
  • MJ3 : Brine channels
    
  • MJ4 : Under-ice habitat
    
• N : Coastal habitats
  
• Q : Wetlands
  
• R : Grasslands and lands dominated by forbs, mosses or lichens
  
  • R1 : Dry grasslands
    
  • R2 : Mesic grasslands
    
  • R3 : Seasonally wet and wet grasslands
    
  • R4 : Alpine and subalpine grasslands
    
  • R5 : Forest fringes and clearings and tall forb stands
    
    • R51 : Thermophilous forest fringe of base-rich soils
      
    • R52 : Forest fringe of acidic nutrient-poor soils
      
    • R53 : Macaronesian thermophilous forest fringe
      
    • R54 : Pteridium aquilinum vegetation
      
    • R55 : Lowland moist or wet tall-herb and fern fringe
      
    • R56 : Montane to subalpine moist or wet tall-herb and fern fringe
      
      • R561 : Alpic tall-herb communities
        
      • R562 : Alpic tall grass communities
        
        • R5621 : Alpic tall-grass communities on siliceous substrates
          
        • R5622 : Alpic tall-grass communities on carbonate substrates
          
        • R5623 : Alpic tall-grass communities on drier and warmer slopes
          
      • R563 : Pyreneo-Iberian tall-herb communities
        
      • R564 : Ibero-Mauritanian tall-herb communities
        
      • R565 : Corsican Cymbalaria tall-herb communities
        
      • R566 : Corsican Doronicum tall-herb communities
        
      • R567 : Eastern oro-Mediterranean and Balkan tall-herb communities
        
      • R568 : Alpine Rumex communities
        
      • R569 : Oro-boreal tall-herb communities
        
      • R56A : Ponto-Caucasian tall-herb communities
        
      • R56B : Alpine and subalpine fern stands
        
    • R57 : Herbaceous forest clearing vegetation
      
  • R6 : Inland salt steppes and salt marshes
    
    • R61 : Mediterranean inland salt steppe
      
    • R62 : Continental inland salt steppe
      
      • R621 : Pannonic salt steppes and saltmarshes
        
      • R622 : Ponto-Sarmatic salt steppes and saltmarshes
        
      • R623 : Central Eurasian solonchak grassland with Crypsis
        
      • R624 : Central Balkan salt steppes and saltmarshes
        
    • R63 : Temperate inland salt marsh
      
    • R64 : Semi-desert salt pan
      
    • R65 : Continental subsaline alluvial pasture and meadow
      
  • R7 : Sparsely wooded grasslands
    
• S : Heathland, scrub and tundra
  
• T : Forest and other wooded land
  
• U : Inland habitats with no or little soil and mostly with sparse vegetation
  
• V : Vegetated man-made habitats