Common name: Crown-spined Pencil Urchin

General information

The Pencil Urchin, scientifically known as Prionocidaris baculosa, is a distinctive sea urchin species recognized by its long, thick, pencil-like spines. These urchins are part of the Echinoidea class and are found in various regions of the Indo-Pacific. They play a crucial role in the ecosystem by grazing on algae, which helps prevent algal overgrowth on reefs.

Care

In the aquarium, Pencil Urchins require a tank with plenty of live rock and a stable environment to thrive. They are generally hardy and can adapt to a range of conditions, but they do best in systems that mimic their natural habitat with ample space to roam. It's important to monitor their spine health, as it can be an indicator of water quality and overall well-being.

Reproduction

Reproduction in Prionocidaris baculosa occurs through spawning, where males and females release their gametes into the water column. In the aquarium, breeding is rare, but hobbyists can encourage spawning by maintaining excellent water quality and mimicking natural seasonal changes in temperature and lighting.

Habitat

Pencil Urchins are typically found in the Indo-Pacific region, from the Red Sea to the waters around Japan and south to Australia. They inhabit coral reefs and rocky substrates, often at depths ranging from shallow waters to about 100 meters deep. In the aquarium, replicating their natural environment with a variety of hiding places and stable rock structures is beneficial for their well-being.