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Spongia officinalis
Dark grey to blackish sponge, mainly spherical in shape and of varying size, up to 40cm in diameter. There are numbers of larger openings irregular in distribution, while the surface reminds me of skin with goose bumps.
Common sponge in Adriatic and Mediterranean sea; observed several times on rocky bottom in shallow waters close to shores; and looks for shady places.
Update 23.08.2022 - I believed very firmly that this one was so called 'Kidney sponge' or Chondrosia reniformis, but have found the ID this summer, thanks to website DORIS (only in French, as far as I'm aware doris.ffessm.fr) also quoted in references.
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updated on 23.08.2022 - ID changed from Kidney sponge to Bath sponge, and text, tags & references updated accordingly.