Otolith
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Acanthodii
Pterygotus
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Ostracoderm
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Teleostomi
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Placoderm
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Holocephali
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Erik Jarvik
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List of chordate orders
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Vertebrate paleontology
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Gnathostomata
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Shark
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Vertebrate
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Silurian
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Flatworm
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Geologic time scale
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Chordate
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Chondrichthyes
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Acanthodians
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