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Retusidae
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Coleophysis carinata
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Coleophysis harpa
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Pyrunculus caelatus
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Pyrunculus conulus
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Pyrunculus ovatus
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Retusa alba
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Retusa mayoi
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Retusa montereyensis
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Retusa obtusa
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Retusa ovata
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Retusa semen
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Retusa sulcata
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Retusa truncatula
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Retusa turrita
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Retusa umbilicata
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Retusa xystrum
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Volvulella acuminatus
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Volvulella californica
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Volvulella catharia
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Volvulella cylindrica
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Volvulella panamica
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Volvulella paupercula
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Volvulella persimilis
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Volvulella recta
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Volvulella texasiana
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