In 2010 the Threaded Vertigo was listed as Special Concern by the Committee on the Status of Endangered Wildlife in Canada, the full report is here. They seem to be found mainly on Bigleaf Maple trees on southern Vancouver Island, the Sunshine Coast and one on Saturna Island and have minimal dispersal capabilities -i.e. they ain't flying or jogging to the next tree, which may be a long ways a way when you are but a couple of millimetres long.
At present this species is just known as Nearctula sp. 1 . There isn't any question on the validity of the species, just that it is in a been a taxonomic muddle.