Common Name:  Red Slate Pencil Urchin
Scientific Name: Heterocentrotus  trigonarius


Kingdom: Animalia
Phylum:  Echinodermata
Class:  Echinoidea
Order:  Echinoida
Family: Echinomtridae
Genius: Heterocentrotus
Species: H. trigonarius      



This sea urchin is very interesting you will enjoy reading it.  This sea urchin is very special because of its long spines. The name of the sea urchin is Heterocentrotus   trigonarius or the Red Slate Pencil Urchin. There are many more things about this sea urchin that’s amazing.


The Red Slate Pencil Urchin size is only about 12 inches.  And the color of the Red Slate Pencil Urchin is usually a brownish, yellow, or red. Many live in the same area but they weren't known to hunt together. Their mouths are unique by scraping algae off of rocks. Their spines also provide homes for red shrimps.


They are located in tropical waters of the Indopacific region. They do well in their habit because all they do is really eat off of rocks. Their population is only about 15,000.  There are shrinking by their predators that have been eating them.  


This sea urchin eats algae like most sea urchins. Their mouths are made for scraping algae from the rocks and coral. But their main diet is algae, and it cannot thrive in the absence of it.  Their predators are sea otters, starfish, triggerfish, sea turtles, wolf eels, and almost anything that’s bigger than it. Their spines are not toxic to humans. But they came in handy when they want to wedge themselves into tight places and to get out of harm’s way.


All together this sea urchin is very impressing. Not only by its looks but how has it works. And how it gets through without being in danger. I hope you enjoyed my report on the Red Slate Pencil Urchin.

Author: Carissa C
Published: 02/2008

Daoust, Pam. " | News, Sports, Jobs, Visitor's Information - The Maui News." N.p., n.d. Web. 22 Feb. 2013.

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