A new occurrence of the benthic amphipod Dyopedos monacanthus (Metzger, 1875) in the Southern Baltic Sea - the first record in the Słupsk Furrow

The paper reports on the occurrence of the epibenthic amphipod Dyopedos monacanthus (Metzger, 1875) in the Baltic Sea. This species belongs to the family Dulichiidae and is found in the North Atlantic and European coastal waters from northern Norway to the English Channel and the Danish Straits. Some 50 years ago, only a few individuals of D. monacanthus were occasionally sighted in the western Baltic (the Arkona and Bornholm Basins). In summer 2006, unusual amphipod specimens were noticed at five deep-water stations over the Słupsk Furrow. This was the first time that D. monacanthus was observed in that area, which is currently the easternmost limit of the species’ range in the Baltic Sea.