March 2023
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This study documents foraminiferal faunas from the Mauritanian upper slope and shelf and analyses their association with cold-water coral habitats (=CWCH). It is based on the analysis of foraminiferal tests in 28 sediment samples of the >250 µm fraction only. One hundred and fifty seven benthic species are recorded, described and one hundred and fifty four are imaged. It increases the number of benthic foraminiferal species so far reported in this area from 102 to 157 and their description from 33 to 157.An analysis of the structure, composition, and diversity of the species-rich benthic foraminiferal faunas is given. It reveals the existence of three main faunal clusters: a living coral cluster, a non-living coral cluster and a low diversity/Tetragonostomina rhombiformis Mikhalevich, 1975 cluster. The living coral cluster is dominated by the species Rosalina vermiculata (d'Orbigny, 1839 in Jones, 1994), which until now not has been reported specifically reported as an important species from CWCH. The non-living coral cluster lacks a dominant species and is characterised by a set of species more evenly distributed. A subcluster is found to be associated with dead coral debris. The low diversity/Tetragonostomina rhombiformis cluster is interpreted as an endemic fauna at shallower water-depths with mud as its preferred substrate. This study extends the knowledge on benthic foraminiferal faunas from CWCH and the Mauritanian upper bathyal slope and shelf.