Classification of the suborder Aistopoda
Subor. †Aistopoda Miall 1875
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Fm. †Lethiscidae Wellstead 1982
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Fm. †Oestocephalidae Anderson 2003
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G. †Oestocephalus Cope 1868
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†Oestocephalus amphiuminum Cope 1868
†Oestocephalus granulosum Fritsch 1880
†Oestocephalus nanum Hancock and Atthey 1868
†Oestocephalus pectinatus Cope 1868
†Oestocephalus rectidens Cope 1874
†Oestocephalus vicinum Fritsch 1880
Fm. †Ophiderpetontidae Schwarz 1908
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G. †Ophiderpeton Huxley 1866
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†Ophiderpeton amphiuminum Cope 1868
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Invalid names: Cercariomorphus parvisquamis Cope 1885 [synonym]
†Ophiderpeton brownriggi Wright and Huxley 1871
†Ophiderpeton kirktonense Milner 1994
†Ophiderpeton swisshelmense Thayer 1985
Invalid names: Cercariomorphus Cope 1885 [synonym]
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 linearis Cope 1871
†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]
Invalid names: Dolichosomatidae Lydekker 1889 [synonym]
Fm. †Pseudophlegethontiidae Anderson 2003
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