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>What’s the fish one?

To again quote Wikipedia,

"Tetrapods are descended from fish, so in a break from the long tradition of grouping all fish into a single class (Pisces), modern phylogenetics views fish as a paraphyletic group that includes all vertebrates except tetrapods. To treat fish as a monophyletic group, one would have to classify tetrapods as a clade/subgroup of specialized fish, which would make "fish" and "vertebrates" synonyms."

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Hm. I don't think there is anything wrong with having terms defining paraphyletic groups. I don't think we need to treat fish or plants for that matter as a monophyletic group necessarily in order to avoid misinformation. The group that includes algae and plants is monophyletic after all, but I don't know what that has to do with the original point.

"Are algae plants?" "Yes."

Is incorrect. That it once stood as the best available information is interesting but not relevant to the veracity.

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