Chapter 32 - Deuterostome Animals - 32.2 - Echinoderms and Hemichordates Are Restricted to Marine Enviroonments - 32.2 Recap - Learning Outcomes - Page 689: 2

Tube feet in starfish are used for attachment to underwater surfaces, often in resistance to currents. Tube feet in brittle stars are used for mobility; brittle stars reside in deeper waters that are not subjected to rough currents. Sea cucumbers use their tube feet for both attachment and movement. They also have a ring of tentacles around their mouths that are actually midfield tube feet that assist in feeding.

Tube feet in starfish are used for attachment to underwater surfaces, often in resistance to currents. Tube feet in brittle stars are used for mobility; brittle stars reside in deeper waters that are not subjected to rough currents. Sea cucumbers use their tube feet for both attachment and movement. They also have a ring of tentacles around their mouths that are actually midfield tube feet.