During the Tyro Mauritania-II expedition (5-21.vi.1988) 15 holothurian species were collected between 19 and 1,900 m depth. Twelve species are new to the fauna of Mauritania, including Paracucumaria deridderae spec. nov. Mauritania represents the southern distribution limit of four species also known from Europe, and the northern distribution limit of five species also known from southern Africa
