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
    
    • MH21 : Arctic completely mixed water column with reduced salinity
      
    • MH22 : Atlantic completely mixed water column with reduced salinity
      
    • MH23 : Baltic completely mixed water column with reduced salinity
      
    • MH24 : Black Sea completely mixed water column with reduced salinity
      
    • MH25 : Mediterranean 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
    
    • MH51 : Arctic unstratified water column with reduced salinity
      
    • MH52 : Atlantic unstratified water column with reduced salinity
      
      • MH521 : Atlantic euphotic (epipelagic) zone in unstratified reduced salinity water
        
      • MH522 : Atlantic mesopelagic zone in unstratified reduced salinity water
        
      • MH523 : Atlantic bathypelagic zone in unstratified reduced salinity water
        
      • MH524 : Atlantic abyssopelagic zone in unstratified reduced salinity water
        
    • MH53 : Baltic unstratified water column with reduced salinity
      
      • MH531 : Baltic euphotic (epipelagic) zone in unstratified reduced salinity water
        
      • MH532 : Baltic mesopelagic zone in unstratified reduced salinity water
        
      • MH533 : Baltic bathypelagic zone in unstratified reduced salinity water
        
      • MH534 : Baltic abyssopelagic zone in unstratified reduced salinity water
        
    • 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
    
    • MH71 : Arctic fronts in reduced salinity water column
      
    • MH72 : Atlantic fronts in reduced salinity water column
      
      • MH721 : Atlantic ephemeral fronts in reduced salinity water column
        
      • MH722 : Atlantic seasonal fronts in reduced salinity water column
        
      • MH723 : Atlantic persistent 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
    
    • MHA1 : Arctic fronts in full salinity water column
      
    • MHA2 : Atlantic fronts in full salinity water column
      
    • MHA3 : Baltic fronts in full salinity water column
      
    • MHA4 : Black Sea fronts in full salinity water column
      
    • MHA5 : Mediterranean fronts in full salinity water column
      
• MJ : Ice-associated marine habitats
  
• N : Coastal habitats
  
• Q : Wetlands
  
• 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