Classification of the order Hemizonida

Or. †Hemizonida Spencer 1951
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Fm. †Taeniactinidae Spencer 1927
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Subfm. †Protactininae Spencer 1927
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G. †Protactis Spencer 1927
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†Protactis wenlockensis Spencer 1922
Invalid names: Calyptactininae Spencer 1930 [empty], Taeniactininae Spencer 1927 [empty]
Invalid names: Gnathasterina Spencer 1951 [synonym], Lepyriactinidae Spencer and Wright 1966 [empty]