Classification of Gardiner 1966

Or. Cephalaspida Fischer 1883
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Fm. †Cephalaspidae Huxley 1861
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G. †Cephalaspis Agassiz 1835
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Cephalaspis campbelltonensis Whiteaves 1881
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Invalid names: Cephalaspis whiteavesi Traquair 1890 [synonym]
Cephalaspis canadensis Robertson 1936
Cephalaspis dawsoni Lankester 1870
Cephalaspis jexi Traquair 1893
Cephalaspis novaescotiae Denison 1955
Cephalaspis westolli Russell 1954
Invalid names: Ateleaspidae Traquair 1899 [empty]
G. †Pteronisculus White 1933
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Pteronisculus laetus Gardiner 1966
G. †Bobasatrania White 1932
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Or. †Perleidiformes Berg 1937
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Fm. †Perleididae Brough 1931
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G. †Albertonia Gardiner 1966
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Albertonia cupidinia Lambe 1916
Or. †Hybodontiformes Patterson 1966
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Fm. †Hybodontidae Agassiz 1834
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G. †Hybodus Agassiz 1834
Fm. †Birkeniidae Traquair 1899
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G. †Ctenopleuron Mathew 1907