Also known as “sea hedgehogs”, sea urchins are related to “sand dollars”. They inhabit all oceans, from the shore down to 5,000 meters deep. They move along the ocean floor with hundreds of adhesive “tube feet”, and their mouth is located on the bottom, allowing them to find nutrients with ease. They can even convert carbon dioxide into raw material in order to grow their shell.
Typical sea urchins have spines ranging from 1-3 cm in length, but can reach up to 30 cm with the urchins living in the tropics! The spines protect the urchins from predators, and inflict a painful wound when contacting skin. Some sea urchins even have venemous spines.
All of a sea urchin’s vital organs remain in an enclosed portion of it’s inner body, and the external portion of it’s body is used for movement. They possess a “water vascular system” which pumps water into it’s “feet” to provide compulsion for movement. They build “spicules”, sharp crystalline bones, that constitute the exo-skeleton.
I suppose you could find these spines on any beach, but not with a drilled hole, ready for jewelry-making, like the ones we have here at Happy Mango Beads!
Category : Beads, Beads, Beads