FIGURE 3. P. f in New species and records of Pyrgulopsis (Gastropoda: Hydrobiidae) from the Snake River basin, southeastern Oregon: further delineation of a highly imperiled fauna

FIGURE 3. P. f re s t i sp. nov. A–C. Shells. Scale bar = 1.0 mm. A. Holotype, USNM 1102148. B. Paratype, USNM 1116914. C. USNM 1092860. D. Shell apex, USNM 1116914. Scale bar = 100 µm. E. Close-up of protoconch sculpture, USNM 1116914. Scale bar = 100 µm. F–H. Opercula. Scale bar = 500 µm. F. Outer side, showing frilled whorl, USNM 1102161. G–H. Inner side, showing variation in thickening of attachment scar margin, USNM 1116914, USNM 1102161. Rm = rim.