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Glass Sponge
Intricate glass sponge (Family Euretidae) colonized by zoantharian anemones. Zoantharians are closely related to anemones and corals and often colonize other deep-sea organisms, like this sponge. Seen during the Illuminating Biodiversity in Deep Waters of Puerto Rico 2022 expedition.
Credit

Image courtesy of Illuminating Biodiversity in Deep Waters of Puerto Rico 2022.