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
      
      • MH211 : Arctic completely mixed water column with reduced salinity and short residence time
        
      • MH212 : Arctic completely mixed water column with reduced salinity and medium residence time
        
      • MH213 : Arctic completely mixed water column with reduced salinity and long residence time
        
    • 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
      
    • 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
    
  • MH9 : 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
  
  • 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
    
    • S51 : Mediterranean maquis and arborescent matorral
      
      • S511 : Evergreen Quercus matorral
        
      • S512 : Olea europaea and Pistacia lentiscus matorral
        
      • S513 : Juniper matorral
        
      • S514 : Pinus matorral
        
      • S515 : Tetraclinis articulata matorral
        
      • S516 : Deciduous Quercus matorral
        
      • S517 : Arid zone matorral
        
        • S5171 : Iberian arid zone Ziziphus matorral
          
      • S518 : Laurus nobilis matorral
        
      • S519 : Cypress matorral
        
      • S51A : Zelkova matorral
        
      • S51B : High maquis
        
      • S51C : Low ericaceous maquis
        
      • S51D : Tall Cistus maquis
        
      • S51E : Low Cistus maquis
        
        • S51E1 : Cistus monspeliensis maquis
          
        • S51E2 : Cistus salvifolius maquis
          
        • S51E3 : Cistus populifolius maquis
          
        • S51E4 : Cistus laurifolius maquis
          
        • S51E5 : Cistus psilosepalus maquis
          
        • S51E6 : Cistus crispus maquis
          
        • S51E7 : Cistus incanus maquis
          
        • S51E8 : Cistus albidus maquis
          
      • S51F : Low Cistus - Lavandula stoechas maquis
        
      • S51G : Low sparse maquis
        
      • S51H : Cytisus-dominated maquis
        
      • S51J : Thermo-Mediterranean brushes, thickets and heath-garrigues
        
      • S51K : Euphorbia dendroides formations
        
      • S51L : Ampelodesmos mauritanica -dominated garrigues
        
      • S51M : Chamaerops humilis brush
        
      • S51N : Thermo-Mediterranean broom fields (retamares)
        
      • S51P : Mediterranean gorse-heaths
        
      • S51Q : Iberian thermo-Mediterranean garrigues
        
      • S51R : Stauracanthus boivinii gorse-heaths
        
      • S51S : Cabo de Sao Vicente brushes
        
      • S51T : Thermo-Mediterranean heaths
        
    • S52 : Submediterranean pseudomaquis
      
    • S53 : Spartium junceum scrub
      
    • S54 : Thermomediterranean arid 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
  
  • 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