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
  
• 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
    
    • U61 : Subarctic volcanic field
      
    • U62 : Mediterranean, Macaronesian and temperate volcanic field
      
      • U621 : Italian fumaroles
        
      • U622 : Sicilian fumaroles
        
      • U623 : Pantelleria fumaroles
        
      • U624 : Macaronesian fumaroles
        
      • U625 : East Mediterranean fumaroles and solfataras
        
      • U626 : Peri-Alpine fumaroles, solfataras and mofettes
        
      • U627 : Western Asian fumaroles and solfataras
        
      • U628 : Teide violet community
        
      • U629 : Etna summital communities
        
      • U62A : Western Asian orovolcanic communities
        
      • U62B : Mediterranean, Macaronesian and temperate barren lava fields and flows
        
      • U62C : Mediterranean, Macaronesian and temperate volcanic ash and lapilli fields
        
• V : Vegetated man-made habitats