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
    
  • MH4 : Partially mixed water column with reduced salinity and medium or long residence time
    
    • MH41 : Arctic partially mixed water column with reduced salinity and medium or long residence time
      
    • MH42 : Atlantic partially mixed water column with reduced salinity and medium or long residence time
      
    • MH43 : Baltic partially mixed water column with reduced salinity and medium or long residence time
      
    • MH44 : Black Sea partially mixed water column with reduced salinity and medium or long residence time
      
    • MH45 : Mediterranean partially mixed water column with reduced salinity and medium or long residence time
      
      • MH451 : Mediterranean partially mixed water column with reduced salinity and medium residence time
        
      • MH452 : Mediterranean partially mixed water column with reduced salinity and 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
    
    • 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
    
    • MH91 : Arctic vertically stratified water column with full salinity
      
      • MH911 : Arctic water column with ephemeral thermal stratification and full salinity
        
      • MH912 : Arctic water column with seasonal thermal stratification and full salinity
        
      • MH913 : Arctic water column with permanent thermal stratification and full salinity
        
      • MH914 : Arctic water column with ephemeral halocline and full salinity
        
      • MH915 : Arctic water column with seasonal halocline and full salinity
        
      • MH916 : Arctic water column with permanent halocline and full salinity
        
      • MH917 : Arctic water column with ephemeral oxygen stratification and full salinity
        
      • MH918 : Arctic water column with seasonal oxygen stratification and full salinity
        
      • MH919 : Arctic water column with permanent oxygen stratification and full salinity
        
        • MH9191 : Arctic anoxic water column in water with permanent oxygen stratification and full salinity
          
    • MH92 : Atlantic vertically stratified water column with full salinity
      
      • MH921 : Atlantic water column with ephemeral thermal stratification and full salinity
        
      • MH922 : Atlantic water column with seasonal thermal stratification and full salinity
        
      • MH923 : Atlantic water column with permanent thermal stratification and full salinity
        
      • MH924 : Atlantic water column with ephemeral halocline and full salinity
        
      • MH925 : Atlantic water column with seasonal halocline and full salinity
        
      • MH926 : Atlantic water column with permanent halocline and full salinity
        
      • MH927 : Atlantic water column with ephemeral oxygen stratification and full salinity
        
      • MH928 : Atlantic water column with seasonal oxygen stratification and full salinity
        
      • MH929 : Atlantic water column with permanent oxygen stratification and full salinity
        
    • MH93 : Baltic vertically stratified water column with full salinity
      
    • MH94 : Black Sea vertically stratified water column with full salinity
      
    • MH95 : Mediterranean vertically stratified water column with full salinity
      
  • MHA : 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