EN
The present paper reports for the first time on the occurrence of Platorchestia platensis (Krøyer, 1845) (Crustacea, Amphipoda) in Puck Bay (southern Baltic, Poland) in May 2005. A key to the Baltic talitrids is given, which can be used to identify males and females of the four species occurring on Polish shores (Talitrus saltator, Talorchestia deshayesii, Orchestia cavimana, Platorchestia platensis) and additionally Orchestia gammarellus, which may yet be found in the Polish coastal zone.