Classification of the order Tetradiida
Or. †Tetradiida Okulitch 1936
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Fm. †Tetradiidae Nicholson 1879
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G. †Paratetradium Sokolov 1955
G. †Rhabdotetradium Sokolov 1955
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†Rhabdotetradium frutex Klaamann 1966
†Rhabdotetradium jiangshanense Lin and Zou 1980