Close-up image of part of the shell of a Sea Urchin, Java Point, Craignure, Isle of Mull, Argyll & Bute, Scotland
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Close-up image of part of the shell of a Sea Urchin, Java Point, Craignure, Isle of Mull, Argyll & Bute, Scotland
Regular Sea Urchins exhibit pentamerism: five-fold symmetry. In this image can be seen two ambulacra (yellow) with their rows of pore-pairs, and brownish interambulacra inbetween. The tubercles are non perforated.