Assertion: eurypterid | /r/AtLocation | fresh water
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Source sentences:
text: While it is generally accepted that some eurypterids lived in fresh water, the majority of palaeontologists at the present time still maintain that the early periods of the racial history of these organisms were passed in marine waters and that it was only, indeed, after their acme in development had been reached that these merostomes, becoming at first euryhaline, finally forsook the sea altogether and lived in rivers and in brackish water bodies until they became extinct at the end of the Palaeozoic.