It has moderately short spines with wide bases and sharp tips.
The first dorsal fin is moderately high with a short spine.
The edges of the arms are fringed with short spines.
The summit sits on a short rocky spine, set at right angles to the ridge.
A small ball with hundreds of short spines sticking out all over like a porcupine.
There are a pair of short, upward-facing spines on the waist.
Up to 34cm long with short, rigid spines over the body.
The second instar is a darker brown and has short spines on its body.
The third and fourth walking legs were moderately sized, with short spines.
The margins of the arms are fringed with short white spines.