Classification of the order Spirostreptida

Or. Spirostreptida Cook 1895
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Subor. Cambalidea Bollman 1893
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Fm. Cambalidae Bollman 1893
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G. †Protosilvestria Handschin 1944
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†Protosilvestria sculpta Handschin 1944
Fm. Pseudonannolenidae Silvestri 1895
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G. Epinannolene Broleman 1903