Shells, opercula and radula, F. umpquaensis, sp. n. A Holotype, USNM 1144535 B Shell, USNM 1144736 C Shell, USNM 1144371 D, E Opercula (outer, inner sides), USNM 114535 F Portion of radular ribbon, USNM 1422224 G Central teeth, USNM 1422224 H Lateral teeth, USNM 1422224. Scale bars: A–E, 1.0 mm; F, 100 µm; G–H, 10 µm.

  Part of: Hershler R, Liu H-P, Hubbart N (2017) Two new species of Fluminicola (Caenogastropoda, Lithoglyphidae) from southwest Oregon, USA, and a range extension for F. multifarius. ZooKeys 679: 1-20.