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
  
• MJ : Ice-associated marine habitats
  
  • MJ1 : Sea ice
    
    • MJ11 : Arctic sea ice
      
    • MJ12 : Baltic sea ice
      
  • MJ2 : Freshwater ice
    
    • MJ21 : Arctic freshwater ice
      
  • MJ3 : Brine channels
    
    • MJ31 : Arctic brine channels
      
    • MJ32 : Baltic brine channels
      
  • MJ4 : Under-ice habitat
    
    • MJ41 : Arctic under-ice habitat
      
    • MJ42 : Baltic 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
    
  • R6 : Inland salt steppes and salt marshes
    
    • R61 : Mediterranean inland salt steppe
      
    • R62 : Continental inland salt steppe
      
      • R621 : Pannonic salt steppes and saltmarshes
        
        • R6211 : Saline puszta
          
        • R6212 : Pannonic saline meadows
          
        • R6213 : Pannonic solonetz hollows
          
        • R6214 : Pannonic solonchak hollows
          
        • R6215 : Pelago-Vardarian salt steppes
          
      • R622 : Ponto-Sarmatic salt steppes and saltmarshes
        
        • R6221 : Western Pontic saline steppes
          
        • R6222 : Western Pontic saline meadows
          
        • R6223 : Western Pontic solonetz hollows
          
          • R62231 : Western Pontic Puccinellia solonetz swards
            
          • R62232 : Western Pontic Camphorosma annua hollows
            
          • R62233 : Western Pontic Bassia sedoides hollows
            
          • R62234 : Western Pontic Pholiurus-Plantago hollows
            
          • R62235 : Western Pontic Hordeum hystrix swards
            
        • R6224 : Western Pontic solonchak communities
          
        • R6225 : Western Pontic salt scrubs
          
        • R6226 : Sarmatic saline steppes
          
        • R6227 : Sarmatic saline meadows
          
        • R6228 : Sarmatic solonetz hollows
          
        • R6229 : Sarmatic solonchak hollows
          
      • 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
  
  • U1 : Terrestrial underground caves, cave systems, passages and waterbodies
    
  • U2 : Screes
    
  • U3 : Inland cliffs, rock pavements and outcrops
    
  • U4 : Snow or ice-dominated habitats
    
  • U5 : Miscellaneous inland habitats usually with very sparse or no vegetation
    
  • U6 : Recent volcanic features
    
• V : Vegetated man-made habitats