Classification of the order Tetradiida

Or. †Tetradiida Okulitch 1936
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Fm. †Paleoalveolitidae Okulitch 1935
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G. †Paleoalveolites Okulitch 1935
Fm. †Tetradiidae Nicholson 1879
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G. †Paratetradium Sokolov 1955
G. †Phytopsis Hall 1847
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Phytopsis tubulosum Hall 1847
G. †Rhabdotetradium Sokolov 1955
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Rhabdotetradium frutex Klaamann 1966
Rhabdotetradium jiangshanense Lin and Zou 1980