Abstract
Four species of pycnogonids occurred in the pelagic samples taken in the Rockall Trough to the west of Scotland and Ireland. They are Pallenopsis calcanea, P. tritonis, P. scoparia and an unlikely record of a young Colossendeis species. Two juvenile pycnogonids were found attached to a single coronate scyphomedusan Periphylla periphylla, reinforcing the contention that they are probably associated with such organisms in the meso- and bathypelagic environments.

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