ecofactbook
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species
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Animalia
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Arthropoda
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Trilobita
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Ptychopariida
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Ptychopariidae
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Onchocephalites
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Onchocephalites angustifrons
Onchocephalites claytonensis
Onchocephalites punctatus
Onchocephalites spinulosus
Onchocephalites versilis
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