EUNIS marine habitat classification review 2019

The review of the marine component of the EUNIS habitat classification was initiated in 2014. Marine benthic habitats, marine pelagic and marine ice associated habitats are separated into three distinct groups, each with a separate classification structure. The first major division in the benthic marine part of the EUNIS classification is based on major biological zones (related to depth) and substrate type. Level 3 reflects the main biogeographical regions of Europe’s seas based on their distinct combinations of salinity and temperature regimes (Arctic, Baltic, Atlantic, Mediterranean and Black Sea). From 16 June 2021 the classification was complemented with crosswalks to Habitats Directive Annex I and to European Red List of Habitats. Crosswalks to marine EUNIS habitats of version 2012 need to be revisited.