Updating the distribution status of the critically endangered bamboo coral Isidella elongata (Esper, 1788) in the deep Eastern Mediterranean Sea

Abstract The critically endangered“ bamboo coral” Isidellaelongata is a near-endemic protected species for which limited information exists in the Eastern Mediterranean Sea. The aim of this work was to update the known geographical distribution of I. elongata in the Eastern Mediterraneanby combining literature data with unpublished records (from experimental fisheries surveys and ROV observations) made within the last two decades. Our study revealed 35 records of I. elongata occurrence spanning across the entire Aegean ecoregion. It has been found at a depth range of 126–1125 m. A considerable number of records, in some cases with multiple colonies, were identified in the North Aegean Sea and the HellenicTrench. This study showed that the distribution range of this key species in the Eastern Mediterranean Seais wider than previously thought and provides a baseline for future research and conservation initiatives in Eastern Mediterraneandeep waters.