Kingdom Animalia Linnaeus, 1758 - animals
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   Phylum Hemichordata Bateson, 1885 - hemichordates
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     Class †Graptolithina Bronn, 1849
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       Order †Graptoloidea Lapworth, 1875
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         Genus †Didymograptus McCoy, 1851
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           †Didymograptus bifidus
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           †Didymograptus protobifidus
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