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
  
  • MH1 : Neuston
    
  • MH2 : Completely mixed water column with reduced salinity
    
  • MH3 : Completely mixed water column with full salinity
    
    • MH31 : Arctic completely mixed water column with full salinity
      
    • MH32 : Atlantic completely mixed water column with full salinity
      
    • MH33 : Baltic completely mixed water column with full salinity
      
    • MH34 : Black Sea completely mixed water column with full salinity
      
    • MH35 : Mediterranean 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
    
    • MH51 : Arctic unstratified water column with reduced salinity
      
      • MH511 : Arctic euphotic (epipelagic) zone in unstratified reduced salinity water
        
      • MH512 : Arctic mesopelagic zone in unstratified reduced salinity water
        
      • MH513 : Arctic bathypelagic zone in unstratified reduced salinity water
        
      • MH514 : Arctic abyssopelagic zone in unstratified reduced salinity water
        
    • MH52 : Atlantic unstratified water column with reduced salinity
      
    • MH53 : Baltic unstratified water column with reduced salinity
      
    • MH54 : Black Sea unstratified water column with reduced salinity
      
      • MH541 : Black Seaeuphotic (epipelagic) zone in unstratified reduced salinity water
        
      • MH542 : Black Sea mesopelagic zone in unstratified reduced salinity water
        
      • MH543 : Black Sea bathypelagic zone in unstratified reduced salinity water
        
      • MH544 : Black Sea abyssopelagic zone in unstratified reduced salinity water
        
    • MH55 : Mediterranean unstratified water column with reduced salinity
      
  • MH6 : Vertically stratified water column with reduced salinity
    
    • MH61 : Arctic vertically stratified water column with reduced salinity
      
    • MH62 : Atlantic vertically stratified water column with reduced salinity
      
    • MH63 : Baltic vertically stratified water column with reduced salinity
      
    • MH64 : Black Sea vertically stratified water column with reduced salinity
      
    • MH65 : Mediterranean vertically stratified water column with reduced salinity
      
  • MH7 : Fronts in reduced salinity water column
    
  • MH8 : Unstratified water column with full salinity
    
    • MH81 : Arctic unstratified water column with full salinity
      
    • MH82 : Atlantic unstratified water column with full salinity
      
    • MH83 : Baltic unstratified water column with full salinity
      
    • MH84 : Black Sea unstratified water column with full salinity
      
    • MH85 : Mediterranean 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
  
  • MJ1 : Sea ice
    
  • MJ2 : Freshwater ice
    
  • MJ3 : Brine channels
    
  • MJ4 : Under-ice habitat
    
    • MJ41 : Arctic under-ice habitat
      
    • MJ42 : Baltic under-ice habitat
      
• N : Coastal habitats
  
• Q : Wetlands
  
• R : Grasslands and lands dominated by forbs, mosses or lichens
  
• S : Heathland, scrub and tundra
  
  • S1 : Tundra
    
  • S2 : Arctic, alpine and subalpine scrub
    
  • S3 : Temperate and mediterranean-montane scrub
    
  • S4 : Temperate shrub heathland
    
    • S41 : Wet heath
      
    • S42 : Dry heath
      
      • S421 : Submontane Vaccinium - Calluna heaths
        
        • S4211 : North Atlantic Vaccinium - Empetrum - Racomitrium heaths
          
        • S4212 : Sub-boreal Vaccinium heaths
          
        • S4213 : Hercynian Vaccinium heaths
          
        • S4214 : Submontane Alpine Vaccinium heaths
          
        • S4215 : Submontane Pyreneo-Cantabrian Vaccinium heaths
          
        • S4216 : Collinar-montane Carpathian Vaccinium heaths
          
      • S422 : Sub-Atlantic Calluna - Genista heaths
        
      • S423 : Atlantic Erica - Ulex heaths
        
      • S424 : Ibero-Atlantic Erica - Ulex - Cistus heaths
        
      • S425 : Boreo-Atlantic Erica cinerea heaths
        
      • S426 : Inland dune heaths
        
    • S43 : Macaronesian heath
      
  • S5 : Maquis, arborescent matorral and thermo-Mediterranean scrub
    
  • S6 : Garrigue
    
  • S7 : Spiny Mediterranean heaths (phrygana, hedgehog-heaths and related coastal cliff vegetation)
    
  • S8 : Thermo-Atlantic xerophytic scrub
    
  • S9 : Riverine and fen scrubs
    
• T : Forest and other wooded land
  
• U : Inland habitats with no or little soil and mostly with sparse vegetation
  
• V : Vegetated man-made habitats