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With current estimates approximating up to 10,000 different species of sponge, the impressive biodiversity and vast geographic range should not be all that surprising.  Recently, the orange fan sponge underwent a scientific name change from Axinella bookhouti to Axinella polycapella - documentation regarding that name change can be found on the website.

There are many interesting divergences found between the different species of sponge. Others have vastly improved the quality of their environments through endosymbiotic alliances with photosynthetic microorganisms, with the result being the production of a greater amount of food and oxygen than the amount consumed.