A chiefly aquatic worm with an elongated, unsegmented, flattened body that is typically brightly colored and tangled in knots, and a long proboscis for catching food.
- ‘These include the sea star Odontaster validus, the sea urchin Sterechinus neumayeri and the ribbon worm Parborlasia corrugatus; all of which produce eggs’
- ‘Beneath loosely embedded rocks hide the brittle stars, ribbon worms and slithery, clinging fish called blennies.’
- ‘In many ribbon worms and echinoderms, metamorphosis is remarkably rapid, with the major changes from larval to adult body form taking less than half an hour.’
- ‘Bootlace worm: These slender ribbon worms are usually around 5m long when fully extended, but they can reach up to 30m.’
- ‘And the list continues: there are sea stars that split in half, marine ribbon worms that break up into dozens of small pieces and sponges that fragment.’