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Map of the native distribution of Nematostella vectensis (blue shading), based on Hand and Uhlinger 1994. Approximate locations of established introductions are starred, with references including those of dates of original regional detection and/or of important distribution information. a Three locations in the U.K. (Stephenson, 1935; reviewed by Hand and Uhlinger 1994; Reitzel et al. 2008); b Pacific Coast of Oregon, Washington and California south to San Francisco
