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
    
    • MC11 : Arctic circalittoral rock
      
    • MC12 : Atlantic circalittoral rock
      
      • MC121 : Faunal turf communities on Atlantic circalittoral rock
        
        • MC1211 : Balanus crenatus and Tubularia indivisa on extremely tide-swept Atlantic circalittoral rock
          
        • MC1212 : Tubularia indivisa on tide-swept Atlantic circalittoral rock
          
        • MC1213 : Bryozoan turf and erect sponges on tide-swept Atlantic circalittoral rock
          
        • MC1214 : Corynactis viridis and a mixed turf of crisiids, Bugula, Scrupocellaria, and Cellaria on moderately tide-swept exposed Atlantic circalittoral rock
          
        • MC1215 : Mixed turf of hydroids and large ascidians with Swiftia pallida and Caryophyllia smithii on weakly tide-swept Atlantic circalittoral rock
          
        • MC1216 : Flustra foliacea and colonial ascidians on tide-swept moderately wave-exposed Atlantic circalittoral rock
          
        • MC1217 : Sparse sponges, Nemertesia spp., and Alcyonidium diaphanum on Atlantic circalittoral mixed substrata
          
        • MC1218 : Suberites spp. with a mixed turf of crisiids and Bugula spp. on heavily silted moderately wave-exposed Atlantic circalittoral rock
          
        • MC1219 : Flustra foliacea and Haliclona oculata with a rich faunal turf on tide-swept Atlantic circalittoral mixed substrata
          
        • MC121A : Molgula manhattensis with a hydroid and bryozoan turf on tide-swept moderately wave-exposed Atlantic circalittoral rock
          
        • MC121B : Sponges and anemones on Atlantic circalittoral vertical bedrock
          
      • MC122 : Echinoderms and crustose communities on Atlantic circalittoral rock
        
      • MC123 : Brachiopod and ascidian communities on Atlantic circalittoral rock
        
      • MC124 : Faunal communities on variable salinity Atlantic circalittoral rock
        
      • MC125 : Communities on Atlantic circalittoral soft rock
        
      • MC126 : Communities of Atlantic circalittoral caves and overhangs
        
      • MC127 : Vents and seeps in Atlantic circalittoral rock
        
      • MC128 : Sabellaria on Atlantic circalittoral rock
        
    • MC13 : Baltic ciralittoral rock
      
    • MC14 : Black Sea circalittoral rock
      
    • MC15 : Mediterranean 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
    
    • ME61 : Arctic upper bathyal mud
      
    • ME62 : Atlantic upper bathyal mud
      
    • ME64 : Black Sea upper bathyal mud
      
    • ME65 : Mediterranean upper bathyal mud
      
  • MF1 : Lower bathyal rock
    
  • MF2 : Lower bathyal biogenic habitat
    
  • MF3 : Lower bathyal coarse sediment
    
  • MF4 : Lower bathyal mixed sediment
    
    • MF41 : Arctic lower bathyal mixed sediment
      
    • MF42 : Atlantic lower bathyal mixed sediment
      
    • MF44 : Black Sea lower bathyal mixed sediment
      
    • MF45 : Mediterranean 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
    
  • 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
  
• S : Heathland, scrub and tundra
  
• T : Forest and other wooded land
  
• U : Inland habitats with no or little soil and mostly with sparse vegetation
  
• V : Vegetated man-made habitats