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
    
    • MH31 : Arctic completely mixed water column with full salinity
      
    • MH32 : Atlantic completely mixed water column with full salinity
      
    • MH33 : Baltic completely mixed water column with full salinity
      
    • MH34 : Black Sea completely mixed water column with full salinity
      
    • MH35 : Mediterranean completely mixed water column with full salinity
      
      • MH351 : Mediterranean completely mixed water column with full salinity and short residence time
        
      • MH352 : Mediterranean completely mixed water column with full salinity and medium residence time
        
      • MH353 : Mediterranean completely mixed water column with full salinity and long residence time
        
  • 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
      
      • MH641 : Black Sea water column with ephemeral thermal stratification and reduced salinity
        
      • MH642 : Black Sea water column with seasonal thermal stratification and reduced salinity
        
      • MH643 : Black Sea water column with permanent thermal stratification and reduced salinity
        
      • MH644 : Black Sea water column with ephemeral halocline and reduced salinity
        
      • MH645 : Black Sea water column with seasonal halocline and reduced salinity
        
      • MH646 : Black Sea water column with permanent halocline and reduced salinity
        
      • MH647 : Black Sea water column with ephemeral oxygen stratification and reduced salinity
        
      • MH648 : Black Sea water column with seasonal oxygen stratification and reduced salinity
        
      • MH649 : Black Sea water column with permanent oxygen stratification and 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
      
    • MH73 : Baltic fronts in reduced salinity water column
      
      • MH731 : Baltic ephemeral fronts in reduced salinity water column
        
      • MH732 : Baltic seasonal fronts in reduced salinity water column
        
      • MH733 : Baltic persistent fronts in reduced salinity water column
        
    • MH74 : Black Sea fronts in reduced salinity water column
      
      • MH741 : Black Sea ephemeral fronts in reduced salinity water column
        
      • MH742 : Black Sea seasonal fronts in reduced salinity water column
        
      • MH743 : Black Sea persistent fronts in reduced salinity water column
        
    • MH75 : Mediterranean fronts in reduced salinity water column
      
  • MH8 : Unstratified water column with full salinity
    
    • MH81 : Arctic unstratified water column with full salinity
      
      • MH811 : Arctic euphotic (epipelagic) zone in unstratified full salinity water
        
      • MH812 : Arctic mesopelagic zone in unstratified full salinity water
        
      • MH813 : Arctic bathypelagic zone in unstratified full salinity water
        
      • MH814 : Arctic abyssopelagic zone in unstratified full salinity water
        
    • 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
      
    • 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
      
    • MH95 : Mediterranean vertically stratified water column with full salinity
      
  • MHA : 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