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A Review of the North American Freshwater Snail Genus Pyrgulopsis

A Review of the North American Freshwater Snail Genus Pyrgulopsis

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96<br />

SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />

FIGURE 39.—Central radular teeth <strong>of</strong> western <strong>Pyrgulopsis</strong>: a, P. pilsbryana, USNM 858279 (bar = 13.6 nm); b,<br />

P. pisteri, USNM 850364 (bar = 20.0 jun); c, P. robusta, USNM 874185 (scale as in b); d, P. roswellensis,<br />

USNM 873132 (bar = 12.0 \un); e, P. simplex, USNM 847236 (scale as in d);f, P. sola, USNM 850290 (bar =<br />

7.5 Jim).

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