Classification of Zangerl 1953
Fm. †Protostegidae Cope 1873
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Subfm. †Chelospharginae Zangerl 1953
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Subfm. †Protosteginae Wieland
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G. †Protostega Cope 1871
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†Protostega eaglefordensis Zangerl 1953
†Protostega gigas Cope 1871
†Protostega potens Hay 1908