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159 hydrobiid mud snails species
Pyrgulopsis thompsoni
Floridobia monroensis
Floridobia parva
Floridobia wekiwae
Marstonia castor
Marstonia olivacea
Marstonia pachyta
Pyrgulopsis avernalis
Pyrgulopsis bacchus
Pyrgulopsis conica
Pyrgulopsis cruciglans
Pyrgulopsis crystalis
Pyrgulopsis glandulosa
Pyrgulopsis sanchezi
Pyrgulopsis fairbanksensis
Pyrgulopsis erythropoma
Pyrgulopsis micrococcus
Pyrgulopsis montezumensis
Pyrgulopsis morrisoni
Pyrgulopsis nevadensis
Pyrgulopsis pecosensis
Peringia ulvae
Pyrgulopsis roswellensis
Pyrgulopsis simplex
Pyrgulopsis perturbata
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