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
  
• 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
    
  • 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
    
    • U11 : Cave
      
    • U12 : Disused underground mines and tunnels
      
  • U2 : Screes
    
  • U3 : Inland cliffs, rock pavements and outcrops
    
    • U31 : Boreal and arctic siliceous inland cliff
      
    • U32 : Temperate high-mountain siliceous inland cliff
      
    • U33 : Temperate, lowland to montane siliceous inland cliff
      
      • U331 : Middle European lowland to montane siliceous cliffs
        
      • U332 : Helleno-Carpatho-Balkanic Silene siliceous cliffs
        
      • U333 : Lowland northern- and middle-European siliceous cliffs
        
      • U334 : Bare temperate lowland to montane siliceous inland cliff
        
      • U335 : Temperate lowland to montane disused siliceous quarries
        
    • U34 : Mediterranean siliceous inland cliff
      
    • U35 : Boreal and arctic base-rich inland cliff
      
    • U36 : Temperate high-mountain base-rich inland cliff
      
    • U37 : Temperate, lowland to montane base-rich inland cliff
      
    • U38 : Mediterranean base-rich inland cliff
      
    • U39 : Boreal ultramafic inland cliff
      
    • U3A : Temperate ultramafic inland cliff
      
    • U3B : Mediterranean ultramafic inland cliff
      
      • U3B1 : Aegeo-east-Mediterranean ultramafic chasmophyte communities
        
      • U3B2 : Mediterranean bare inland basaltic and ultra-basic cliffs
        
      • U3B3 : Mediterranean serpentine and basaltic cliff communities
        
    • U3C : Macaronesian inland cliff
      
    • U3D : Wet inland cliff
      
      • U3D1 : Mediterranean wet inland cliffs
        
      • U3D2 : Northern wet inland cliffs
        
      • U3D3 : Illyrio-Helleno-Balkanic wet carbonate cliffs
        
    • U3E : Limestone pavement
      
  • 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
  
  • V1 : Arable land and market gardens
    
  • V2 : Cultivated areas of gardens and parks
    
  • V3 : Artificial grasslands and herb dominated habitats
    
  • V4 : Hedgerows
    
    • V41 : Hedgerows of non-native species
      
    • V42 : Highly-managed hedgerows of native species
      
    • V43 : Species-rich hedgerows of native species
      
    • V44 : Species-poor hedgerows of native species
      
  • V5 : Shrub plantations
    
  • V6 : Tree dominated man-made habitats
    
    • V61 : Broadleaved fruit and nut tree orchards
      
    • V62 : Evergreen orchards and groves
      
    • V63 : Lines of planted trees
      
    • V64 : Small deciduous broadleaved planted other wooded land
      
    • V65 : Small evergreen broadleaved planted other wooded land
      
    • V66 : Small coniferous planted other wooded land