What would terrestrial animals derived from cnidarian ancestors look like?

I have wondered what a terrestrial ecosystem would look like dominated by cnidarians and ctenophores rather than insects and tetrapods. In order to fulfill the same niches I imagine they would need to be highly derived compared to their ancestral forms. Since their physiology is so different I am having difficulty figuring the path from, say, a jellyfish to a longlimbed Savannah grazer with a mass of tentacles for a face.

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What would terrestrial animals derived from cnidarian ancestors look like?

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