There are more than 1,000 sea anemone species found throughout the world ... the bi-products of the algae's photosynthesis. They form another, more famous symbiotic alliance with clownfish ...
More information: Katrin Linse et al, A new species of Fissidentalium (Scaphopoda: Dentaliidae) in association with an actinostolid anemone from the abyssal Labrador Sea, Marine Biodiversity (2024).