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Animalia
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Brachiopoda
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Rhynchonellata
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Athyridida
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Anoplothecidae
Athyrididae
Diplospirellidae
Koninckinidae
Meristellidae
Meristidae
Neoretziidae
Nucleospiridae
Parazygidae
Retziidae
Rhynchospirinidae
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Anoplothecidae