|My polychaete worm in the aquarium, about 6 inches long stretched out.|
|Zooming in. Those green fang-like structures are just palps, sensory organs. So are all the tentacles.|
At one point while I was watching, Mr. Worm stretched out and up to the surface of the water. He moved too fast for me, so I ended up cutting off the tips of his palps. And he never gave me a second chance.