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Little jellies, the cnidaria, didn't have it, and one could argue that with radial symmetry it isn't useful.— Pharyngula
Schierwater B, Jakob W, Dellaporta SL, Miller DJ (2006) Axial patterning and diversification in the cnidaria predate the Hox system.— PLoS ONE Alerts: New Articles
After comparing the sequences of 104 Trichoplax genes with their counterparts in other organisms, they concluded that placozoans aren't the oldest animals; they branched off after sponges but before cnidaria.— Uncommon Descent
There are four stems belonging to the coelenteria: the gastraeads ("primitive-gut animals"), sponges, cnidaria, and platodes.— The Evolution of Man — Volume 1
Without going into the difficult question of the origin of this stem, we must emphasise the fact that the vertebrate stem has no direct affinity whatever to five of the other ten stems; these five isolated phyla are the sponges, cnidaria, molluscs, articulates, and echinoderms.— The Evolution of Man — Volume 1

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