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A new species of a phyllophorid holothurian, Neothyonidium arthroprocessum, is described from the shallow waters of False Bay, South Africa. The new species is distinct from other phyllophorids in possessing peculiar narrow transverse slits in the body wall, a calcareous ring with joined posterior processes to the radial plates, and short thick perforated rods as body wall deposits. The diagnosis of the genus Neothyonidium is amended to accommodate the new species.