This subclass are considered ‘modern’ sea urchins. The slate-pencil urchin, Heterocentrotus mamillatus, is an example of the Cidaroidea sea urchins, the only living order of the subclass ...

The results were clear: Two species of triggerfish, blunthead and finescale, did all the urchin eating, and they had a very clear preference for large pencil urchins. Smaller pencil urchins and ...

The spines of the urchin, so dangerous yet beautiful ... MASONS NEWS SERVICE Jen started making pencil sculptures in 1999 Credit: MASONS NEWS SERVICE Her work has been featured in scores of ...