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
    
    • MA61 : Arctic littoral mud
      
    • MA62 : Atlantic littoral mud
      
    • MA63 : Baltic hydrolittoral mud
      
    • MA64 : Black Sea littoral mud
      
    • MA65 : Mediterranean littoral mud
      
      • MA651 : Assemblages of Mediterranean littoral muddy sands and muds in lagoons and estuaries biocenosis
        
        • MA6511 : Mediterranean mediolittoral mud association with halophytes
          
        • MA6512 : Mediterranean mediolittoral mud facies of saltworks
          
  • 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
    
    • MD61 : Arctic offshore circalittoral mud
      
    • MD62 : Atlantic offshore circalittoral mud
      
    • MD63 : Baltic offshore circalittoral mud
      
    • MD64 : Black Sea offshore circalittoral mud
      
    • MD65 : Mediterranean offshore circalittoral mud
      
  • ME1 : Upper bathyal rock
    
  • ME2 : Upper bathyal biogenic habitat
    
  • ME3 : Upper bathyal coarse sediment
    
    • ME31 : Arctic upper bathyal coarse sediment
      
    • ME32 : Atlantic upper bathyal coarse sediment
      
    • ME34 : Black Sea upper bathyal coarse sediment
      
    • ME35 : Mediterranean 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
  
  • MH1 : 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
    
    • MH71 : Arctic fronts in reduced salinity water column
      
    • MH72 : Atlantic fronts in reduced salinity water column
      
    • MH73 : Baltic fronts in reduced salinity water column
      
    • MH74 : Black Sea fronts in reduced salinity water column
      
    • MH75 : Mediterranean fronts in reduced salinity water column
      
  • MH8 : 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
  
• 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
    
  • 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