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Illinois Natural History Survey
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Gastropoda
[Orthogastropoda]
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Siphonariidae
Siphonaria
Siphonaria alternata
Siphonaria brannani
Siphonaria lecanium
Siphonaria maura
Siphonaria pectinata
Siphonaria serrata
[
Siphonaria natalensis
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Siphonaria thersites
Williamia
Williamia krebsii
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Williamia krebsi
]
Williamia peltoides
Williamia radiata