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Word Count: 271
The common name for the starfish is the sea star There are an estimated 1500 living species of these marine animals characterized by having no back bone invertebrate and having arms which are all around the body with locomotery tubed feet Generally starfish are rather stiff bodied animals that crawl slowly accorded the bottom of the ocean floor Their mouth is directly under them They have arms radiating all around them each arm has many rows of tube feet used for crawling attachment and eating Their arm length varies as well as the number of arms They could have as little as four all the way to as many as fifty they usually have no anus if they do have one it is on the top of their body structure Their skin is rough and leathery it usually has spines or spikes of some sort The animal has a large gut a complex system of body cavities and a simple brain less nervous system Starfish are found at the bottom of the ocean They play an important role in the communities because they eat a variety materials and are often numerous Some are pests to the oyster beds Sometimes some species of starfish have population explosions that damage coral reefs through over feeding on the coral Some adult animals feed on starfish but they dont taste very well nor are they nutritious Scientific Classification Starfish belong to the phylum Echinodermata They constitute the class Asteroidea The star fish is the most un common animal in the marine aquariums and The marin biologists are not fastinated by the animals in the marine world
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