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Aka a Ribbon worm. Cerebratulus marginatus can reach a length of a meter. This one was making use of an old tube created by a Calcareous Tube Worm where much of its body was knotted up in. These are predators and feed on invertebrates such as clams and polychaete worms. Here is a video of it approaching a Calcareous Tube Worm. The tube worm appears to have a protective partner - making the ribbon worm retract.:https://www.youtube.com/watch?v=7ZrmO5GsLQU
Spotted under a rock in a tide pool at low tide at Tongue Point Marine Sanctuary.
Lat: 48.17, Long: -123.71
Spotted on Aug 3, 2019
Submitted on Aug 7, 2019