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Spiny Urchin

A Diadema sea urchin documented during Dive 672.
A Diadema sea urchin documented during Dive 672. Photo: ROV SuBastian/Schmidt Ocean Institute under CC BY-NC-SA

This spiny fellow belongs to a genus of sea urchins known as Diadema, which are commonly found in tropical waters. It was discovered on the northern flank of Motu Motiro Hiva.