Tube feet

Sea urchin tube feet extended past the spines.

Tube feet (technically podia) are small active tubular projections on the oral face of an echinoderm, whether the arms of a starfish, or the undersides of sea urchins, sand dollars and sea cucumbers; they are more discreet though present on brittle stars, and have only a feeding function in feather stars. They are part of the water vascular system.[1]

  1. ^ "Morphology". Echinodermata. University of California Museum of Paleontology.

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