Indophyllia macassarensis is the rarest of the three Donut coral species, looking like a Cynarina lacrymalis but free-living on sandy substrates like Acanthophyllia deshayesiana. Side by side, true Indophyllia have thicker, shorter septa than Cynarina, with characteristic “jaguar spots” and squiggles on the vesicles. Some authorities suspect hybridization among Cynarina and Acanthophyllia, and even further…
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