Symmoriida

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Superregnum: Eukaryota
Regnum: Animalia
Phylum: Chordata
Cladus: Chordata Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Classis: Chondrichthyes
Subclassis: Elasmobranchii
Superordo: Selachimorpha
Ordo: †Symmoriida
Familiae: Symmoriidae - Falcatidae - Stethacanthidae