The two known collection localities of Stygoporus oregonensis. Oregon/Washington State boundary in black. County boundaries in brown. Blue shaded region outlined with a dotted line corresponds to Willamette Lowland basin-fill aquifers. Type locality indicated by red star with black border. New collection locality indicated by black star.

  Part of: Kanda K, Gomez AR, Van Driesche R, Miller KB, Maddison DR (2016) Phylogenetic placement of the Pacific Northwest subterranean endemic diving beetle Stygoporus oregonensis Larson & LaBonte (Dytiscidae, Hydroporinae). ZooKeys 632: 75-91.