Rhodolith occurrences in the Azores (central north Atlantic) between 1998 and 2018. EMODNET Biology dataset:IMAR-Institute of Marine Research, University of the Azores, Portugal; (2021):

Rhodoliths is a general term used to designate non-geniculate coralline red algae (Rhodophyta) that live unattached (Riosmena-Rodríguez, 2017). The term is used here to encompass (i) branched free-living coralline algae devoid of an evident nucleus, but also (ii) nucleated nodules where the biogenic calcium carbonate deposit around the core represents >50%, as well as (iii) “coated grains” where the core is larger than the algal carbonate component

Black coral occurrences on the Azores shelves (central north Atlantic) from 1991 to 2019

Black corals are antipatharian corals that occur from sublittoral to abyssal depths on hard, mixed and soft substrates. Under favourable conditions, some black coral species form dense stands known as black coral gardens which create habitat for a variety of associated specie