Genus
Common name: Slate Pencil Urchin
Scientific name: Heterocentrotus
Heterocentrotus is a genus of sea urchins commonly known as Slate Pencil Urchins, notable for their thick, blunt spines that resemble pencils. These urchins are popular in reef aquariums for their unique appearance and their role in algae control. They are generally peaceful and can coexist with a variety of tank mates. However, care should be taken as their spines can break off and become embedded in soft tissues of corals or injure other invertebrates. They are best suited for larger tanks with plenty of live rock to graze on and hide among.