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Phyla are not a classification of how good the broth of an organism tastes. Your question could just as easily be posed about beef and skunk broth (or since the phylum for mammals is chordata, even beef and [*sea squirt*](https://en.wikipedia.org/wiki/Polycarpa_aurata) broth).

The cookbook helpfully mentions a detail someone might find useful. Just take the advice or decide to experiment on your own. You can write a sea snail soup cookbook!