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
    
    • MH11 : Arctic neuston
      
    • MH12 : Atlantic neuston
      
    • MH13 : Baltic neuston
      
    • MH14 : Black Sea neuston
      
    • MH15 : Mediterranean 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
    
    • MH61 : Arctic vertically stratified water column with reduced salinity
      
      • MH611 : Arctic water column with ephemeral thermal stratification and reduced salinity
        
      • MH612 : Arctic water column with seasonal thermal stratification and reduced salinity
        
      • MH613 : Arctic water column with permanent thermal stratification and reduced salinity
        
      • MH614 : Arctic water column with ephemeral halocline and reduced salinity
        
      • MH615 : Arctic water column with seasonal halocline and reduced salinity
        
      • MH616 : Arctic water column with permanent halocline and reduced salinity
        
      • MH617 : Arctic water column with ephemeral oxygen stratification and reduced salinity
        
      • MH618 : Arctic water column with seasonal oxygen stratification and reduced salinity
        
      • MH619 : Arctic water column with permanent oxygen stratification and 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
      
      • MHA21 : Atlantic ephemeral fronts in full salinity water column
        
      • MHA22 : Atlantic seasonal fronts in full salinity water column
        
      • MHA23 : Atlantic persistent 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
      
      • MHA51 : Mediterranean ephemeral fronts in full salinity water column
        
      • MHA52 : Mediterranean seasonal fronts in full salinity water column
        
      • MHA53 : Mediterranean persistent 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
  
• T : Forest and other wooded land
  
• U : Inland habitats with no or little soil and mostly with sparse vegetation
  
• V : Vegetated man-made habitats