Two new species of (Caenogastropoda, Lithoglyphidae) from southwest Oregon, USA, and a range extension for .

We describe two new species of pebblesnails (Lithoglyphidae: ) from southwest Oregon based on morphologic and mitochondrial DNA (COI, cytB) evidence. , which had been traditionally identified as prior to the recent restriction of the latter to the lower Columbia River drainage, lives in lotic habitats in the Umpqua River basin. This species is readily distinguished from closely related and by shell and anatomical characters, and by its mtDNA sequences (divergence >3.