Classification of the genus Tretaspis
G. †Tretaspis M'Coy 1849
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†Tretaspis anderssoni Stormer 1945
†Tretaspis askerensis Owen 1980
†Tretaspis ceriodes angelini Stormer 1930
†Tretaspis hadelandica brachystichus Ingham 1970
†Tretaspis hisingeri Owen 1980
†Tretaspis kiaeri Stormer 1930
†Tretaspis latilimba Linnarsson 1869
†Tretaspis latilimbus norvegicus Owen 1980
†Tretaspis moeldenensis Cave 1960
†Tretaspis reticulata Ruedemann 1901
†Tretaspis sagenosus Whittington 1959
†Tretaspis seticornis seticornis Hisinger 1840
†Tretaspis sortita Reed 1935
†Tretaspis sortita broeggeri Stormer 1945