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Porpita seen from above. The brown colour of its associated algal cells is visible in the central disc, where they concentrate. The radial forest of tentacles becomes very thick in these older specimens, which can be 5 centimetres across. Lizard Island, Australia (2003) Nikon F3 | Custom Optics | Fuji Velvia - Invisible Oceans Founder's Collection
(open in OpenSea)