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
  
• MJ : Ice-associated marine habitats
  
• N : Coastal habitats
  
• Q : Wetlands
  
  • Q1 : Raised and blanket bogs
    
  • Q2 : Valley mires, poor fens and transition mires
    
  • Q3 : Palsa mires
    
  • Q4 : Base-rich fens and calcareous spring mires
    
    • Q41 : Alkaline, calcareous, carbonate-rich small-sedge spring fen
      
    • Q42 : Extremely rich moss-sedge fen
      
    • Q43 : Tall-sedge base-rich fen
      
    • Q44 : Calcareous quaking mire
      
    • Q45 : Arctic-alpine rich fen
      
      • Q451 : Carex saxatilis fens
        
      • Q452 : Carex frigida fens
        
      • Q453 : British Carex demissa - Saxifraga aizoides flushes
        
      • Q454 : Icelandic Carex bigelowii fens
        
      • Q455 : Icelandic Equisetum palustre fens
        
      • Q456 : Arctoalpine Kobresia simpliciuscula and Carex microglochin swards
        
      • Q457 : Alpine riverine Carex maritima (Carex incurva) swards
        
      • Q458 : Arctoalpine riverine Equisetum, Typha and Juncus swards
        
      • Q459 : British mica flushes
        
      • Q45A : Boreal Carex atrofusca swards
        
      • Q45B : Boreal marsh-fens
        
    • Q46 : Carpathian travertine fen with halophytes
      
  • Q5 : Helophyte beds
    
  • Q6 : Periodically exposed shores
    
• 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
    
• V : Vegetated man-made habitats