Pyrgulopsis sanchezi Hershler, Liu & Bradford 2013

Pyrgulopsis sanchezi, is a species of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Hydrobiidae.

This species is endemic to the Amargosa River basin in California and Nevada, United States. Its natural habitat is springs.

Shell (Fig. 7A–D) ovate to narrow conic, whorls 3.5–4.75. Teleoconch whorls medium convex, sometimes strongly shouldered, last 0.25–0.50 whorl sometimes slightly loosened. Aperture ovate, sometime strongly angled adapically, parietal lip complete, narrowly adnate or slightly disjunct, umbilicus usually narrow. Apertural lip sometimes rather thickened and/or slightly reflected, outer lip orthocline or prosocline. Operculum (Fig. 7E–F) as for genus; outer side smooth or with last 0.5 whorl weakly frilled; inner side smooth or slightly thickened along a small portion of the muscle attachment margin. Radula (Fig. 7G–I) as for genus; dorsal edge concave, lateral cusps three–six, basal cusp one. Lateral teeth having one–four cusps on inner sides and two–six cusps on outer sides. Inner marginal teeth with 10–26 cusps, outer marginal teeth with 12–33 cusps. Radula data are from BellMNH 21116, USNM 857963, USNM 883361, USNM 883365, USNM 883372. Penis (Fig. 4E–F) medium-sized; filament short, broad, strongly tapering, oblique; lobe short, rectangular, horizontal or slightly oblique; small (terminal) ovate gland almost always present on ventral surface of lobe (92/93 specimens), gland usually positioned horizontally, rarely borne on a raised swelling (one specimen), one specimen had a second, dot-like gland on the ventral surface of the lobe. Penial data are from BellMNH 2116, USNM 857963, USNM 857964, USNM 883361, USNM 883666. Shell parameters for Pyrgulopsis sanchezi. Measurements are in mm.
WH SH SW HBW WBW AH AW SW/SH HBW/SH AH/SH Holotype, USNM 850333 4.25 2.50 1.73 1.95 1.40 1.10 1.07 0.69 0.78 0.44 USNM 1204735 (n=10) Mean 4.33 2.43 1.66 1.82 1.33 1.06 0.99 0.68 0.75 0.43 S.D. 0.21 0.14 0.10 0.10 0.06 0.06 0.07 0.04 0.02 0.02 Range 4.00–4.75 2.22–2.70 1.46–1.81 1.68–1.94 1.22–1.44 0.96–1.16 0.90–1.08 0.62–0.73 0.70–0.78 0.40–0.46

Distributed in five separate groundwater discharge areas of the Amargosa River basin: Grapevine Springs (M2), Ash Meadows (M8, M51, M53, M57), Tecopa (M25), Shoshone (M26), Saratoga Spring (SS) (Fig. 2). The type locality (Fig. 5B) is a flowing well that was drilled into a small spring mound (Dudley and Larson 1976).