Spoon Worms

This group of unsegmented worms mostly live buried in sand or soft sediment, where they use their long non-retractable proboscis to feed. Often this is the only part of the animal that is visible. While spoon worms have been considered to belong to their own phylum - Echiura - and are still classified this way by the Australian Faunal Directory, they are now considered to be a type of segmented worms that has evolved to lose their segmentation, and many authorities have revised them as an order of polychaete worms.