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
    
  • MH7 : Fronts in reduced salinity water column
    
  • MH8 : Unstratified water column with full salinity
    
  • MH9 : Vertically stratified water column with full salinity
    
    • MH91 : Arctic vertically stratified water column with full salinity
      
    • MH92 : Atlantic vertically stratified water column with full salinity
      
    • MH93 : Baltic vertically stratified water column with full salinity
      
      • MH931 : Baltic water column with ephemeral thermal stratification and full salinity
        
      • MH932 : Baltic water column with seasonal thermal stratification and full salinity
        
      • MH933 : Baltic water column with permanent thermal stratification and full salinity
        
      • MH934 : Baltic water column with ephemeral halocline and full salinity
        
      • MH935 : Baltic water column with seasonal halocline and full salinity
        
      • MH936 : Baltic water column with permanent halocline and full salinity
        
      • MH937 : Baltic water column with ephemeral oxygen stratification and full salinity
        
      • MH938 : Baltic water column with seasonal oxygen stratification and full salinity
        
      • MH939 : Baltic water column with permanent oxygen stratification and 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
    
    • 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
    
• 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
  
  • U1 : Terrestrial underground caves, cave systems, passages and waterbodies
    
  • U2 : Screes
    
  • U3 : Inland cliffs, rock pavements and outcrops
    
  • U4 : Snow or ice-dominated habitats
    
  • U5 : Miscellaneous inland habitats usually with very sparse or no vegetation
    
  • U6 : Recent volcanic features
    
    • U61 : Subarctic volcanic field
      
    • U62 : Mediterranean, Macaronesian and temperate volcanic field
      
      • U621 : Italian fumaroles
        
      • U622 : Sicilian fumaroles
        
      • U623 : Pantelleria fumaroles
        
      • U624 : Macaronesian fumaroles
        
      • U625 : East Mediterranean fumaroles and solfataras
        
      • U626 : Peri-Alpine fumaroles, solfataras and mofettes
        
      • U627 : Western Asian fumaroles and solfataras
        
      • U628 : Teide violet community
        
      • U629 : Etna summital communities
        
      • U62A : Western Asian orovolcanic communities
        
      • U62B : Mediterranean, Macaronesian and temperate barren lava fields and flows
        
      • U62C : Mediterranean, Macaronesian and temperate volcanic ash and lapilli fields
        
• V : Vegetated man-made habitats