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Classification of the order Siphonophorida
Or.
Siphonophorida
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G. †
Protolyella
Fm.
Velellidae
Brandt 1835
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G. †
Plectodiscus
Ruedemann 1916
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†
Plectodiscus berlinensis
Hogler and Hanger 1989
G. †
Silurovelella
Fisher 1957