A Review of the North American Freshwater Snail Genus Pyrgulopsis
A Review of the North American Freshwater Snail Genus Pyrgulopsis
A Review of the North American Freshwater Snail Genus Pyrgulopsis
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FIGURE 22.—Western <strong>Pyrgulopsis</strong>: a-d. P. nevadensis (a, shell, USNM 590364, 4.8 mm; b, shell, ANSP<br />
187693,6.1 mm; c, d, opercula, USNM 63992, bars = 0.46 mm, 0.43 mm); e-g, P. owensensis, USNM 857955<br />
(e, shell, 2.3 mm;/^P opercula, bar = 0.3 mm); h, shell, P. palomasensis, USNM 130016 (2.5 mm).<br />
SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY