ecofactbook
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species
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Animalia
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Arthropoda
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Ostracoda
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Palaeocopida
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Ballardina
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Ballardina concentrica
Ballardina geniculata
Ballardina gibbera
Ballardina millersburgia
Ballardina minuta
Ballardina simplex
Ballardina simplissima
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Ballardina concentrica