North American Hydrobiidae (Gastropoda: Rissoacea): Redescription and Systematic Relationships of <I>Tryonia</I> Stimpson, 1865 and <I>Pyrgulopsis</I> Call and Pilsbry, 1886
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North American Hydrobiidae (Gastropoda: Rissoacea): Redescription and Systematic Relationships of Tryonia Stimpson, 1865 and Pyrgulopsis Call and Pilsbry, 1886