Tuxedo Urchin

Mespilia globulus

Habitat & Distribution :  Coral reef, reef rubble, seagrass beds, depths of 0 – 200 m, Indo-Pacific Ocean

Diet : Organic material

Size: Up to 5 cm

Lifespan: 1 - 2 years

Description

The tuxedo urchin is called as such due to its no-spine zones that have a velvety texture, coming in elegant blue/green shades that resemble a tuxedo. The spines on this urchin is also dark in color, red, or brown.

Behavior

It is a nocturnal forager, and would hide in reef crevices during the day. Commonly found in most shallow tropical waters, especially around coral rubble or seagrass beds.

This urchin is often found collecting rubble, algae and debris on its body as an attempt at camouflage and self-protection.

Reproduction

It is found closer inshore on breeding seasons. Fertilization is external and egg brooding is common, usually placed somewhere on its body.

Communication & Perception

When a sea urchin is injured or dies, it releases a chemical signal to warn other urchins of the presence of a predator or other dangers. The other urchins can "smell" this chemical through their tube feet and quickly make their escape. They can also sense light (i.e. "see") that is absorbed in their spines.

The sea urchin has also been observed using physical contact with each other to communicate, especially in the presence of food, helping to keep their population stable in places with abundance of algae.

Predator(s)

Sharks, sea otters, sea stars, wolf eels (Anarrhichthys ocellatus), triggerfish, and humans

Conservation Status: Not Evaluated