The taxonomy and distribution of sipunculan species in the shallow-water zone (< 200 m depth) of European seas are fairly well-documented. One notable exception is Phascolosoma intermedium, a small-sized species described by Southern (1913 a) from material dredged off the west coast of Ireland at 44–143 m depth. Since its description, no further specimens of P. intermedium have been reported in the region and the species was not considered by Stephen (1960) in his synopsis of the British species.