Barentsia benedeni is a cosmopolitan species. In the Northeast Pacific, the species has been recorded at several sites in California and Oregon, including the Salton Sea, Elkhorn Slough, San Francisco Bay, Lake Merritt, and Coos Bay. This species also has been collected from numerous locations around the world, including Europe, Japan, and Australia (Wasson 1997). Its native geographical range remains uncertain, but the species may have originated in Europe (Carlton 1978).
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