Echinodermata (echinoderms), class: Ophiuroidea (brittlestars & basketstars) Collection Highlights | Updated 6 years ago Ophiomastix mixta Photo by Clay Bryce, image copyright WA Museum Like the asteroids, ophiuroids have five long arms, and they can grow up to 60cm. The mouth has five jaws and also acts as an anus. Ophiuroids are mostly scavengers and use their long arms and tube feet to move food to their mouth. Ophiuroids move by propelling their arms in a snake-like fashion. Marine Invertebrates Section View the discussion thread.