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The cobalt sponge, Acanthancora cyanocrypta, is a species in the demosponge family that forms a thin (1-2 mm) sheet-like covering on shallow intertidal rocky reefs up to 37 meters deep in the eastern Pacific.  Found between British Columbia and northern Mexico, A. cyanocrypta’s cobalt blue coloring, caused by symbiotic, photosynthetic blue-green algae, is unique and clearly distinguishes it from other sponges.  This sponge is common especially on the bottom side of overhanging rocks and crevices in high flow but protected surfaces, and is a well-known part of kelp forest ecosystems.  Although it frequently has other organisms living on its surface, it has few known predators (Byrnes et al. 2011; McDonald 2009; SIMoN).


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