This worm is found round the coasts of north west Europe, the Mediterranean Sea, the Gulf of Maine and Cobscook Bay.
The lower part of the bay is also home to four important sub-basins: Passamaquoddy Bay and Back Bay on the New Brunswick shore, Cobscook Bay on the Maine shore, and the Annapolis Basin on the Nova Scotia shore.
An invertebrate of special concern is the mystery snail (Vertigo paradoxa), an air-breathing land snail.
It is also found in the north-west Atlantic in the area of Cobscook Bay, the Gulf of Maine and the Gulf of St Lawrence.
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Idotea balthica has a broad geographical distribution, having been recorded from the Belgian Exclusive Economic Zone, Great Britain, Cobscook Bay, Dutch Exclusive Economic Zone, European waters, Greek Exclusive Economic Zone, Gulf of Maine, Knokke, North West Atlantic, Red Sea, Voordelta, West Coast of Norway, Wimereux and the Black Sea.
The move was criticized by Governor Paul LePage who also stated that in the event of another shutdown, he would order the Washington County Sheriff to forcibly open Cobscook Bay State Park if necessary.