Distribution Northwestern USA and Eurasia. Distribution maps for US species from Wagner (1985)
Systematics An unpublished revision by Wagner (1985) for the North American species suggested monophyly with Phymatopus hecta of Europe due to the uniquely shared absence of tarsi on the metathoracic legs. This feature is currently not confirmed for the eastern Asian species.
Biology Larvae of North American Phymatopus feed on grasses, shrubs, and ferns. The European species feed on roots (see species pages)
References Maron, J.L. 2001.Intraspecific competition and subterranean herbivory: individual and interactive effects on bush lupine. Oikos 92, 178-186. Tshistjakov, Y.A. 1996.Taxonomic study of the Far Eastern hepialid moths. Record 1. Pm systematic position of the Phymatopus taxa described from the east Palaearctic. Far Eastern Entomologist 36, 1-8. Wagner, D. L., 1985. The biosystematics of the Holarctic Hepialidae, with special emphasis on the Hepialus californicus species group. PhD Dissertation. University of California, Berkeley, 395 (Diss. Abs. Order No. DA8610260).