Close-up of a very spiny Ochre Sea Star (Pisaster ochraceus). The rounded white spines (or tubercles) are calcareous projections of the sea star's internal skeleton.
Close-up of the madreporite (or sieve plate) of an Ochre Sea Star (Pisaster ochraceus). [I introduced madreporites back in 2013, so if you're interested in reviewing that post, check out "Take five" from 7 May 2013.]
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