摘要：Orchestia cavimana, a semiterrestrial amphipod of presumably Mediterranean origin was found for the first time in a freshwater habitat in Poland in October 2009, in the main Vistula channel at Świbno. Most probably the species reached this locality from the nearby Baltic coast by natural spread up the river. Taking into account its high abundance at the site and presence of immature individuals, the species has probably established a permanent population in this new habitat in Poland.
