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
      
      • MH211 : Arctic completely mixed water column with reduced salinity and short residence time
        
      • MH212 : Arctic completely mixed water column with reduced salinity and medium residence time
        
      • MH213 : Arctic completely mixed water column with reduced salinity and long residence time
        
    • 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
      
      • MH251 : Mediterranean completely mixed water column with reduced salinity and short residence time
        
      • MH252 : Mediterraneancompletely mixed water column with reduced salinity and medium residence time
        
      • MH253 : Mediterranean completely mixed water column with reduced salinity and long residence time
        
  • MH3 : Completely mixed water column with full salinity
    
    • MH31 : Arctic completely mixed water column with full salinity
      
      • MH311 : Arctic completely mixed water column with full salinity and short residence time
        
      • MH312 : Arctic completely mixed water column with full salinity and medium residence time
        
      • MH313 : Arctic completely mixed water column with full salinity and long residence time
        
    • MH32 : Atlantic completely mixed water column with full salinity
      
    • MH33 : Baltic completely mixed water column with full salinity
      
      • MH331 : Baltic completely mixed water column with full salinity and short residence time
        
      • MH332 : Baltic completely mixed water column with full salinity and medium residence time
        
      • MH333 : Baltic completely mixed water column with full salinity and long residence time
        
    • 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
    
    • 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
      
  • MH5 : Unstratified water column with reduced salinity
    
  • MH6 : 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
      
    • 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
      
      • MH751 : Mediterranean ephemeral fronts in reduced salinity water column
        
      • MH752 : Mediterranean seasonal fronts in reduced salinity water column
        
      • MH753 : Mediterranean persistent 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
      
    • MH94 : Black Sea vertically stratified water column with full salinity
      
      • MH941 : Black Sea water column with ephemeral thermal stratification and full salinity
        
      • MH942 : Black Sea water column with seasonal thermal stratification and full salinity
        
      • MH943 : Black Sea water column with permanent thermal stratification and full salinity
        
      • MH944 : Black Sea water column with ephemeral halocline and full salinity
        
      • MH945 : Black Sea water column with seasonal halocline and full salinity
        
      • MH946 : Black Sea water column with permanent halocline and full salinity
        
      • MH947 : Black Sea water column with ephemeral oxygen stratification and full salinity
        
      • MH948 : Black Sea water column with seasonal oxygen stratification and full salinity
        
      • MH949 : Black Sea water column with permanent oxygen stratification and full salinity
        
    • MH95 : Mediterranean vertically stratified water column with full salinity
      
      • MH951 : Mediterranean water column with ephemeral thermal stratification and full salinity
        
      • MH952 : Mediterranean water column with seasonal thermal stratification and full salinity
        
      • MH953 : Mediterranean water column with permanent thermal stratification and full salinity
        
      • MH954 : Mediterranean water column with ephemeral halocline and full salinity
        
      • MH955 : Mediterranean water column with seasonal halocline and full salinity
        
      • MH956 : Mediterranean water column with permanent halocline and full salinity
        
      • MH957 : Mediterranean water column with ephemeral oxygen stratification and full salinity
        
      • MH958 : Mediterranean water column with seasonal oxygen stratification and full salinity
        
      • MH959 : Mediterranean water column with permanent oxygen stratification and 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
  
• 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