This large male, Jassa marmorata, is a tube building amphipod. It builds and lives in a tube of detritus and pieces of algae cemented together by its mucousy silk. Clive Brown's crab pot ropes in certain areas off Guernsey's south coast get coated by a thick layer of detritus and algae formed by this animal. This amphipod came up from a depth of about 50 metres and was photographed on 16 April 2003. Its identity was confirmed by Dr. Sammy De Grave from Oxford University's Museum of Natural History. File No. 34-658 ©RLLord - sealord