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
  
• 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
    
    • R41 : Snow-bed vegetation
      
    • R42 : Boreal and arctic acidophilous alpine grassland
      
    • R43 : Temperate acidophilous alpine grassland
      
    • R44 : Arctic-alpine calcareous grassland
      
    • R45 : Alpine and subalpine calcareous grassland of the Balkans and Apennines
      
  • 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
      
      • R551 : Screens or veils of perennial tall herbs lining watercourses
        
      • R552 : Tall-herb communities of humid meadows
        
      • R553 : Shady woodland edge fringes
        
      • R554 : Mediterranean grasslands on alluvial river banks
        
    • R56 : Montane to subalpine moist or wet tall-herb and fern fringe
      
      • R561 : Alpic tall-herb communities
        
      • R562 : Alpic tall grass communities
        
      • 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
    
  • 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