AbstractAnalyses were made of subfossilEubosminaremains from two Berlin Lakes. The first postglacial eubosminid wasB. (E.) longispina.In Tegeler See it occurred from the Alleröd to Atlantic 2. In Lake Unterhavel it disappeared earlier in the Boreal.Bosmina (E.) longicornisoccurred in early Atlantic 1 resp. at the end of Atlantic 2 (Tegeler See).Bosmina (E.) c. coregoniappeared in Lake Unterhavel at the end of the Boreal, in Lake Tegeler See at early Boreal.Bosmina (E.) c. thersitesoccurred only in sediments of Lake Unterhavel beginning in Atlantic 2.No sign of a “morphological transition” between taxa found by HOFMANNcould be found in the two investigated lakes. The succession ofEubosminataxa seems to be mainly the result of immigra