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A Gw’o loosely resembles a starfish crossed with an octopus. The Gw’o’s five flexible extremities are equally spaced around a disklike central mass. Each tubular tentacle—tubacle—harkens back to the Gwo’s ancestral, free-ranging tube worms. From the mouth inward, arrayed in consecutive rings around the tube’s inner surface, are teeth, eyes, ears, and the myriad chemoreceptors for taste and smell. Shared organs, including most of the central nervous system, reside in the central disk. Flattened and with its tubacles outstretched, a Gw’o spans about two-thirds of a meter.