Live Aquaria:  Quality Aquatic Life Direct To Your Door
Free Shipping!
Home > Urchins > Pencil Urchin
Pencil Urchin (Eucidaris tribuloides)
Pencil Urchin
Please Note: Due to variations within species, your item may not look identical to the image provided. Approximate size range may also vary between individual specimen.
Please Note: Due to variations within species, your item may not look identical to the image provided. Approximate size range may also vary between individual specimen.
Pencil Urchin (Eucidaris tribuloides)

Quick Stats

Care Level Moderate
Temperament Peaceful
Color Form Black, Red, Tan, White
Diet Omnivore
Reef Compatible No
Water Conditions 72-78° F, dKH 8-12, pH 8.1-8.4, sg 1.023-1.025
Max. Size 5"
Family Cidaridae
Minimum Tank Size 30 gallons
What do these Quick Stats mean? Click here for more information
Care Level Moderate
Temperament Peaceful
Color Form Black, Red, Tan, White
Diet Omnivore
Reef Compatible No
Water Conditions 72-78° F, dKH 8-12, pH 8.1-8.4, sg 1.023-1.025
Max. Size 5"
Family Cidaridae
Minimum Tank Size 30 gallons
What do these Quick Stats mean? Click here for more information

Overview

Did you know that this specimen ships from our LiveAquaria® Wisconsin Facility, home of our popular Diver's Den® WYSIWYG Store and our LiveAquaria® Certified Captive Grown Corals (CCGC)? What that means is that you can rest assured knowing this specimen received the highest level of care from our experienced and professional LiveAquaria® staff! PLUS, hobbyists that use our LiveAquaria® Professional Reef Salt have the added benefit knowing marine species shipped from our LiveAquaria® Wisconsin Facility share the same water parameters. In other words, if you use our Professional Reef Salt, marine species shipped from our Wisconsin Facility will acclimate and transition to your home aquarium with less stress to set the foundation for longer term success. The Pencil Urchin of the Eucidaris genera is also known as the Mine or Club Urchin. It has a brown, sometimes mottled body with stubby, thick spines radiating out in all directions. The spines are surrounded by basal plates. Never try to pry it out of a hole, as you will break its spines before it lets go. As it ages, its spines may become covered with coralline and other types of algae.

During the day it will seek shelter in the rocks; at night it will come out and forage for food, looking particularly for algae lawns and smaller invertebrates like sea squirts or sponges. It can be destructive to corals. It requires an aquarium with multiple hiding places and live rock on which it can graze. The rock formations should be sturdy, since the Urchin could dislodge rocks as it moves around the tank. The Pencil Urchin is very sensitive to high levels of copper-based medications and will not tolerate high levels of nitrates. If water conditions are poor, it will shed its spines.

It is extremely difficult to breed in an aquarium and has no distinguishing characteristics to help differentiate it from its mate.

It should be offered dried seaweed and some animal-based supplemental foods.

Approximate Purchase Size: Small: 1" to 1-1/2"; Medium: 1-1/2" to 2-1/2"; Large: 2-1/2" to 3-1/2"

Supplies You May Be Interested In

Customer Testimonials

K Andon Saint Charles , IL
I have had one of these for years. Its a very neat addition. I did have to move it from my reef tank to my FOWLR due to it eating my sponges, corals, and moving rocks around. Overall I would recommend it for a FOWLR.
1-1 of 1 testimonials

Bookmark and Share
LAQ-AZ-WEB-01-P