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Spiny sea creatures built on five-way symmetry, with feet powered by plumbing.

means A group of marine animals — starfish, sea urchins, sea cucumbers — with radial symmetry and water-driven tube feet.

from From Greek echinos (hedgehog) plus derma (skin), naming the spiky-skinned starfish-and-urchin crew.

Fivefold symmetryBodies built around five, not left-right halves
Hydraulic feetThey walk on seawater-pumped tube feet
RegrowthMany regrow lost arms, some whole bodies
Larval secretBabies are bilaterally symmetric, like us
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