Claim: The polyps of Pseudoplexaura porosa (commonly known as the porous sea rod or the porous false plexaura) spread out their tentacles to feed on plankton and other fine organic particles both day and night; while the octocoral has symbionts in the form of single-celled protists that inhabit the tissues.
Evidence: Pseudoplexaura porosa, commonly known as the porous sea rod or the porous false plexaura, is a species of gorgonian-type colonial octocoral in the family Plexauridae. The polyps spread out their tentacles to feed on plankton and other fine organic particles both day and night. The octocoral has symbionts in the form of single-celled protists called zooxanthellae that inhabit the tissues.