Genus
Common name: Pencil Urchin
Scientific name: Eucidaris
Eucidaris is a genus of sea urchins commonly known as Pencil Urchins. They are characterized by their thick, blunt spines that resemble pencils, which provide protection and deter predators. These urchins are found in various marine environments, from shallow reefs to deeper waters. In the aquarium, they are appreciated for their unique appearance and their role in grazing on algae. However, they can be quite destructive to corals and other invertebrates, so they should be added with caution to a reef tank. Pencil Urchins are generally hardy and can adapt to a range of water conditions, but they require stable water quality and plenty of live rock to thrive.