Classification of Fortey 1990
Cl. †Trilobita Walch 1771 [trilobite]
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Subcl. †Libristoma Fortey 1990
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Or. †Asaphida Salter 1864
Or. †Proetida Fortey and Owens 1975
Or. †Ptychopariida Swinnerton 1915
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Subor. †Olenina Hupe 1952
Subor. †Ptychopariina Richter 1933
Invalid names: Harpina Whittington 1959 [empty]