In effect, this squirts sticky threads all over a predator. sea urchins, sea biscuits, and sandollars are examples of … When startled, these cucumbers may expel the tubules through a tear in the wall of the cloaca. Crinoidea. Sea cucumbers feed on tiny particles like algae, minute aquatic animals, or waste materials, which they gather in with 8 to 30 tube feet that look like tentacles surrounding their mouths. a feather star and a sea lily would belong to what class? Some species of coral reef sea cucumbers defend themselves by expelling sticky cuvierian tubules to entangle potential predators. sea lilies have the most... up. Echinoidea. a feather star had a mouth that faces... sea lilly. how do sea cucumbers defend themselves? brittle star. Sea cucumbers defend themselves in a quite unique/unusual manner. These tubules are attached to the respiratory tree in the gut. sea urchin photo. Sea cucumbers generally defend themselves by spitting out their viscera and shooting themselves away, in the hope that whatever predator was bothering them would be … sea star. fossils. Basically the animal shoots poisonous darts from their anus!