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Fig. 10a, b: The skeletons of zooxanthellate and azooxanthellate scleractinian coral species are very often colonized by endolithic algae. a) Close-up of a living colony of Mycedium elephantotus, a species particularly abundant between 20 and 40 m. b) A cleaned skeletal fragment heavily infested with Ostreobium quekettii. The diameter of the calices range between 5 and 7 mm. An electron micrograph (SEM) is shown in Fig. 11. |