Diphyllobothrium is a genus of tapeworms which can cause diphyllobothriasis in humans through consumption of or undercooked fish. The principal species causing diphyllobothriasis is "D. latum", known as the broad or fish tapeworm, or broad fish tapeworm. "D. latum" is a pseudophyllid cestode that infects fish and mammals. "D. latum" is native to Scandinavia, western Russia, and the Baltics, though it is now also present in North America, especially the Pacific Northwest. In Far East Russia, "D. klebanovskii", having Pacific salmon as its second intermediate host, was identified.