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
      
      • MH241 : Black Sea completely mixed water column with reduced salinity and short residence time
        
      • MH242 : Black Sea completely mixed water column with reduced salinity and medium residence time
        
      • MH243 : Black Sea completely mixed water column with reduced salinity and long residence time
        
    • 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
      
    • MH32 : Atlantic completely mixed water column with full salinity
      
      • MH321 : Atlantic completely mixed water column with full salinity and short residence time
        
      • MH322 : Atlantic completely mixed water column with full salinity and medium residence time
        
      • MH323 : Atlantic completely mixed water column with full salinity and long residence time
        
    • MH33 : Baltic completely mixed water column with full salinity
      
    • MH34 : Black Sea completely mixed water column with full salinity
      
      • MH341 : Black Sea completely mixed water column with full salinity and short residence time
        
      • MH342 : Black Sea completely mixed water column with full salinity and medium residence time
        
      • MH343 : Black Sea completely mixed water column with full salinity and long residence time
        
    • 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
    
    • MH51 : Arctic unstratified water column with reduced salinity
      
    • MH52 : Atlantic unstratified water column with reduced salinity
      
    • MH53 : Baltic unstratified water column with reduced salinity
      
    • 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
      
      • MH621 : Atlantic water column with ephemeral thermal stratification and reduced salinity
        
      • MH622 : Atlantic water column with seasonal thermal stratification and reduced salinity
        
      • MH623 : Atlantic water column with permanent thermal stratification and reduced salinity
        
      • MH624 : Atlantic water column with ephemeral halocline and reduced salinity
        
      • MH625 : Atlantic water column with seasonal halocline and reduced salinity
        
      • MH626 : Atlantic water column with permanent halocline and reduced salinity
        
      • MH627 : Atlantic water column with ephemeral oxygen stratification and reduced salinity
        
      • MH628 : Atlantic water column with seasonal oxygen stratification and reduced salinity
        
      • MH629 : Atlantic water column with permanent oxygen stratification and 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
    
  • MH8 : Unstratified water column with full salinity
    
  • MH9 : 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
  
  • S1 : Tundra
    
  • S2 : Arctic, alpine and subalpine scrub
    
  • S3 : Temperate and mediterranean-montane scrub
    
  • S4 : Temperate shrub heathland
    
  • S5 : Maquis, arborescent matorral and thermo-Mediterranean scrub
    
  • S6 : Garrigue
    
  • S7 : Spiny Mediterranean heaths (phrygana, hedgehog-heaths and related coastal cliff vegetation)
    
  • S8 : Thermo-Atlantic xerophytic scrub
    
  • S9 : Riverine and fen scrubs
    
• T : Forest and other wooded land
  
• U : Inland habitats with no or little soil and mostly with sparse vegetation
  
• V : Vegetated man-made habitats