WASHINGTON— A federal judge reinstated endangered status for the West Virginia northern flying squirrel late Friday, holding that the U.S. Fish and Wildlife Service had violated the Endangered Species Act by not following its own recovery plan for the species in its decision to remove protection for the rare animal. The ruling — made in response to a 2009 lawsuit by the Center for Biological Diversity, Friends of Blackwater, the Wilderness Society, Heartwood, the Southern Appalachian Forest Coalition and WildSouth — has broad implications for all threatened and endangered species.