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Systematophora placacantha
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General Images Stratigraphy Description Literature Notes
placacantha
Deflandre, G. and Cookson, I.C. (1955)
Eaton, G.L., Fensome, R.A., Riding, J.B. and Williams, G.L. (2001)
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active
Impletosphaeridium placacanthum
Cleistosphaeridium placacanthum
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