Purple Pin Cushion
have hair thin feelers between their spines that pick up things and carry them around.

The spines are solid calcium carbonate aka chalk.

have feelers too but carry much less. The bare sections are blue and brown.

Long Spine
I’ve seen these with 30+ inch spines while snorkeling and they grow very fast. Small fish will live amongest the spines of larger urchins.

Red Slate Pencil
The Hawaiian species has very thick spines covered in deep red coralline algae.

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