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Haliotis tuberculata
Linnaeus, 1758
João Pedro Silva Any idea on what this might be? <1cm long, inside a colony of Pentapora foliacea, Berlengas Portugal, ~27m deep, water temp. 18ºC. Sorry for the bad quality crop. Shot it because it looked like a small Haliotis tuberculata but lighting the photo was hard so after this shot I went looking for other subjects.
Marco Faasse Maybe a pectinid bivalve with a sponge on the upper valve?