Purple Urchin - Group of 2 Reviews

Member Reviews

  • Purple Urchin

    Posted by xobklynqt143

  • Interesting to observe, active, easy to find
  • eats our coraline algea, knocks things over
  • When we bought our live rock there were 4 of these types of urchins that came home as hitchhikers.  We ended up returning 3 of them and keeping one as our tank was brand new.  our urchin started out at about the size of a quarter and is now easily 3.5 inches in diameter and the tank was started only 5 months ago.  It was great having it in the tank from teh start up as it was extremely interesting to watch how it moved and ate.  It has eaten almost all of the lovely purple algea off of our rock, turning it white and has knocked things over several times.  The bubble coral doesn't seem to fond of it's pointiness either LOL.

Facts & Details

The Purple Urchin is a small Urchin that is dark purple in color with medium-sized spines, which are tan in color. These Urchins are nocturnal and do most of their grazing at night. During the day they will usually stay stationary on the aquarium glass, or in hiding spots in rockwork. All Urchins like lots of rockwork that they can crawl and feed on. They are excellent algae eaters.Urchins belong to a Class known as Echinoidea, which consists of creatures that have a skeleton made of ten plates covered with spines. Urchins have mostly round bodies with protective spines on their upperside and tubular feet and a mouth on the underside. Artistotle once wrote of the five parts of the Urchin's mouth: "In reality the mouth-apparatus of the urchin is continuous from one end to the other, but to outward appearance it is not so, but looks like a horn lantern with the panes of horn left out." This holds true today as the mouth of the Urchin is referred to as "Aristotle's Lantern". The mouth of the Urchin is used to scrape algae from rockwork. The spines of the Urchin are a defense mechanism that are barbed like that of a fish hook and can inflict serious pain to the predator. These spines can either come to a sharp point or can be stubby and blunt.

Purple Urchin - Group of 2

Purple Urchin - Group of 2


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