Observations of the echiuran worm Bonellia viridis in the deep basin of the northern Evoikos Gulf, Greece

Towed underwater TV observations at 440 m in the northern Evoikos Gulf, Gre ece, revealed a soft mud plain heavily bioturbated by the thalassinidean Ca locaris macandreae, with Callianassa subterranea and Nephrops norvegicus al so present. Ejecta mounds and feeding traces indicated the presence of a la rge echiuran, provisionally identified as Maxmuelleria gigas. The locality also supported a dense population of a second echiuran, Bonellia viridis, a species not previously recorded as an inhabitant of sedimentary environmen ts.