Symmoriidae is an extinct family of cartilaginous fish belonging to the order Symmoriiformes.[1] Members of the family are known from the Devonian and Carboniferous periods.[2] 
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 | | †Altholepidiformes |  |  | 
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 | †Elegestolepidida |  | 
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 | †Tchunacanthidae |  FecundosquamaLenacanthusTchunacanthus
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 | †Ischnacanthiformes | |  AcanthospinaCampylodusGranulacanthusOnchusSerradentus
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 | Ischnacanthidae |  ArcticacanthusArenaceacanthusAtopacanthusBracteatacanthusCacheacanthusErymnacanthusEuryacanthusGomphonchusGrenfellacanthusIschnacanthusMarsdenius?PersacanthusPlectrodusRockycampacanthusRohonilepisTaemasacanthusTricuspicanthusXylacanthus
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 | Podoliacanthidae |  | 
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 | Poracanthodidae |  GomphonchoporusMachaeraporusObruchevacanthus?PoracanthodesRadioporacanthodesTaimyrolepisTrundlelepisZemlyacanthus
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 | †Diplacanthiformes |  | 
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 | †Acanthodiformes |  | 
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 | †"Climatiiformes" and related taxa
 | |  BrochoadmonesDobunnacanthusKathemacanthusLupopsyroidesLupopsyrusObtusacanthus
 |  | "Climatiidae" |  BrachyacanthusCanadalepisCheiracanthoidesClimatiusEifellepisEndemolepisErriwacanthusHanilepisIranolepisLaliacanthusLijiangichthysMinioracanthusNodocosta?NostolepoidesParexusPtomacanthusSevyacanthusTareyacanthusVernicomacanthusWatsonacanthusWetteldorfia
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 | Gyracanthidae |  | 
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 | Vesperaliidae |  AcanthacanthusVesperalia
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 | †Lamellin-forming taxa | |  |  | Sinacanthidae |  EosinacanthusHunanacanthusNeosinacanthusSinacanthusTarimacanthus
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 | Mongolepidida | |  |  | Mongolepididae |  MongolepisRongolepisSodolepisTaklamakanolepisTeslepis
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 | Shiqianolepidae |  ChenolepisShiqianolepisTielikewatielepisXiaohaizilepisXinjiangichthys
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 | †Incertae sedis | |  |  | Scale taxa |  AltacollumArauziaCanyonlepis?CladolepisFrigorilepis?FunicristataGualepisHercynolepisIvanelepisJolepisKarksilepisKnerialepisLugalepisLunalepisModicucollumNobilesquamaNogueralepisNostolepisNostovicinaOhiolepisSeretolepisSerpensiugumTuvalepisVerrucasquamaWellingtonella?
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 | "Conventionally defined chondrichthyans"
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| | "Conventionally defined chondrichthyans" | 
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| Taxon identifiers | 
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| Symmoriidae |  | 
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