Question:

Which infraphylum are ALL "Fish" part of?

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An Infraphylum is the biological classification/taxonomic/phylogenic rank between a Subphlum & a Superclass. It's below the Subphylum. It's above the Superclass.

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  1. Your double negatives are a bit confusing.  Do you want to exclude non-fish vertebrates?

    Anyway, Gnathostomata is your answer.

    If you're looking for a Phylum that excludes non-fish vertebrates, sorry doesn't exist.  Phyla are monophyletic.  You're looking for something paraphyletic.  "Fish" would be your best answer.  Fish are a paraphyletic group.

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