Classification of the family Phlegethontiidae

Fm. †Phlegethontiidae Cope 1875
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G. †Dolichosoma Huxley and Wright 1867
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†Dolichosoma emersoni Huxley and Wright 1867
†Dolichosoma scutiferum Fritsch 1901
G. †Phlegethontia Cope 1871
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†Phlegethontia longissima Fritsch 1875
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Invalid names: Aornerpeton mazonensis Gregory 1948 [synonym], Phlegethontia serpens Cope 1871 [synonym]
Invalid names: Aornerpeton Lund 1978 [synonym], Phlegethontia phanerhapha Thayer 1985 [nomen dubium]
G. †Sillerpeton Lund 1978
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†Sillerpeton permianum Lund 1978
Invalid names: Dolichosomatidae Lydekker 1889 [synonym]