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)
  
  • MA1 : Littoral rock
    
  • MA2 : Littoral biogenic habitat
    
  • MA3 : Littoral coarse sediment
    
  • MA4 : Littoral mixed sediment
    
  • MA5 : Littoral sand
    
  • MA6 : Littoral mud
    
  • MB1 : Infralittoral rock
    
  • MB2 : Infralittoral biogenic habitat
    
  • MB3 : Infralittoral coarse sediment
    
  • MB4 : infralittoral mixed sediment
    
  • MB5 : Infralittoral sand
    
  • MB6 : Infralittoral mud
    
  • MC1 : Circalittoral rock
    
  • MC2 : Circalittoral biogenic habitat
    
  • MC3 : Circalittoral coarse sediment
    
  • MC4 : Circalittoral mixed sediment
    
  • MC5 : Circalittoral sand
    
  • MC6 : Circalittoral mud
    
  • MD1 : Offshore circalittoral rock
    
  • MD2 : Offshore circalittoral biogenic habitat
    
  • MD3 : Offshore circalittoral coarse sediment
    
  • MD4 : Offshore circalittoral mixed sediment
    
  • MD5 : Offshore circalittoral sand
    
  • MD6 : Offshore circalittoral mud
    
  • ME1 : Upper bathyal rock
    
  • ME2 : Upper bathyal biogenic habitat
    
  • ME3 : Upper bathyal coarse sediment
    
  • ME4 : Upper bathyal mixed sediment
    
  • ME5 : Upper Bathyal sand
    
  • ME6 : Upper Bathyal mud
    
  • MF1 : Lower bathyal rock
    
  • MF2 : Lower bathyal biogenic habitat
    
  • MF3 : Lower bathyal coarse sediment
    
  • MF4 : Lower bathyal mixed sediment
    
  • MF5 : Lower bathyal sand
    
  • MF6 : Lower bathyal mud
    
  • MG1 : Abyssal rock
    
  • MG2 : Abyssal biogenic habitat
    
  • MG3 : Abyssal coarse sediment
    
  • MG4 : Abyssal mixed sediment
    
  • MG5 : Abyssal sand
    
  • MG6 : Abyssal mud
    
• 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
      
      • R431 : Alpic Nardus stricta swards and related communities
        
      • R432 : Thermo-Alpigenous subalpine acidophilous grassland
        
      • R433 : Alpigenous acidophilous grassland
        
      • R434 : Oro-Hellenic closed grassland
        
      • R435 : Oro-Iberian acidophilous grassland
        
      • R436 : Oro-Corsican grassland
        
      • R437 : Oro-Apennine closed grassland
        
      • R438 : Oro-Moesian acidophilous grassland
        
      • R439 : Western Asian acidophilous alpine grassland
        
      • R43A : Illyrian alpine and subalpine acid open grasslands
        
    • 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
    
  • 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
    
    • U31 : Boreal and arctic siliceous inland cliff
      
      • U311 : Boreal siliceous cliffs
        
      • U312 : Bare boreal and arctic siliceous inland cliff
        
      • U313 : Boreal and arctic disused siliceous quarries
        
    • U32 : Temperate high-mountain siliceous inland cliff
      
    • U33 : Temperate, lowland to montane siliceous inland cliff
      
    • 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
      
      • U381 : Tyrrheno-Adriatic eumediterranean calcicolous chasmophyte communities
        
      • U382 : Western mediterraneo-montane chasmophyte communities
        
      • U383 : Hellenic eumediterranean calcicolous chasmophyte communities
        
      • U384 : Aegeo-east-Mediterranean base-rich inland chasmophyte communities
        
      • U385 : Southern Hellenic Potentilla cliffs
        
      • U386 : Central Hellenic Potentilla cliffs
        
      • U387 : Mediterranean bare limestone inland cliffs
        
      • U388 : Mediterraneo-Anatolian calcicolous chasmophyte communities
        
      • U389 : Mediterranean disused chalk and limestone quarries
        
    • U39 : Boreal ultramafic inland cliff
      
    • U3A : Temperate ultramafic inland cliff
      
    • U3B : Mediterranean ultramafic inland cliff
      
    • U3C : Macaronesian inland cliff
      
    • U3D : Wet inland cliff
      
    • U3E : Limestone pavement
      
  • U4 : Snow or ice-dominated habitats
    
  • U5 : Miscellaneous inland habitats usually with very sparse or no vegetation
    
    • U51 : Fjell field
      
    • U52 : Polar desert
      
    • U53 : Glacial moraines with very sparse or no vegetation
      
  • U6 : Recent volcanic features
    
    • U61 : Subarctic volcanic field
      
    • U62 : Mediterranean, Macaronesian and temperate volcanic field
      
• V : Vegetated man-made habitats