Glaucus atlanticus consumes and reuses the nematocysts of jellyfish siphonophores. Perhaps not quite what you were looking for, as the animal doesn't simply concentrate the toxin, but actually co-opts entire stinging cells.
Further to your mention of dinoflagellate toxins being concentrated by fish, I seem to recall reading something about some toxins being modified in vivo into more toxic derivatives, but cannot find any mention of it.
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