This specimen resembles Edwardsianthus smaragdus and, more closely, E. sapphirus
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Photographs of similar species have often been sent to us by divers in the past, but since the internal morphology (necessary for correct identification) was not known, the identification of these specimens remained uncertain. Actually we inclined to believe that these specimens are related to Mesacmaea: Mesacmaea also has a peculiar arrangement of tentacles, with several upright inner tentacles and with oddly arranged outer tentacles. However, recently these anemones have been studied by Japanese authors Izumi and Fujii (2021) and were shown to belong to Edwardsianthus. Izumi and Fujii (2021) described four new species of Edwardsianthus including species with fluorescent blue tentacles (E. sapphirus), fluorescent green (E. smaragdus), red (E. carbunculus) and pale purple with dark purple spots (E. amethystus).
The specimen from Indonesia on the photo published here, with blue-green tentacles, is somewhat intermediate between the photographs of Edwardsianthus smaragdus and E. sapphirus published in the paper of Izumi and Fujii (2021).
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