Question: Micropalaeosoma balticus is an extinct, fossil turbellarian flatworm known from Baltic amber from an exclave between what two countries? 
Sentence (from "Micropalaeosoma"): Micropalaeosoma balticus (formerly "Palaeosoma balticus" ) is an extinct, fossil turbellarian flatworm known from Baltic amber of Kaliningrad, Russia, that lived approximately 40 million years ago.
Relevant evidence: Yes