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
      
  • 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
    
    • MH81 : Arctic unstratified water column with full salinity
      
    • 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
      
      • MH851 : Mediterranean euphotic (epipelagic) zone in unstratified full salinity water
        
      • MH852 : Mediterranean mesopelagic zone in unstratified full salinity water
        
      • MH853 : Mediterranean bathypelagic zone in unstratified full salinity water
        
      • MH854 : Mediterranean abyssopelagic zone in unstratified full salinity water
        
  • 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
  
  • N1 : Coastal dunes and sandy shores
    
  • N2 : Coastal shingle
    
  • N3 : Rock cliffs, ledges and shores, including the supralittoral
    
    • N31 : Atlantic and Baltic rocky sea cliff and shore
      
    • N32 : Mediterranean and Black Sea rocky sea cliff and shore
      
    • N33 : Macaronesian rocky sea cliff and shore
      
    • N34 : Atlantic and Baltic soft sea cliff
      
      • N341 : Baltic chalk and moraine cliffs
        
    • N35 : Mediterranean and Black Sea soft sea cliff
      
• Q : Wetlands
  
• R : Grasslands and lands dominated by forbs, mosses or lichens
  
• S : Heathland, scrub and tundra
  
• T : Forest and other wooded land
  
  • T1 : Deciduous broadleaved forest
    
  • T2 : Broadleaved evergreen forest
    
  • T3 : Coniferous forest
    
  • T4 : Lines of trees, small anthropogenic forests, recently felled forest, early-stage forest and coppice
    
    • T41 : Early-stage natural and semi-natural forest and regrowth
      
      • T411 : Deciduous scrub forest
        
      • T412 : Mixed scrub forest
        
      • T413 : Coniferous scrub forest
        
      • T414 : Raised bog pre-forests
        
    • T42 : Coppice and early stage plantations
      
    • T43 : Recently felled areas
      
• 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
    
• V : Vegetated man-made habitats