The starfish (commonly as a sea star) is generally found with 5 arms that are attached to a central disc. This central disc is the activity center of the starfish and also contains the mouth of the starfish.
Starfish are marine invertebrates. They typically have a central disc and five arms, though some species have a larger number of arms. The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates. About 1,500 species of starfish occur on the seabed in all the world's oceans, from the tropics to frigid polar waters. They are found from the intertidal zone down to abyssal depths, 6,000 m (20,000 ft) below the surface. Starfish Facts. Starfish belongs to a large group of marine animals called echinoderms. They can be found in all oceans of the world. Largest populations of starfish live in the Indian and Pacific oceans. Starfish (also known as sea stars) are usually located in the shallow water. Interesting Starfish Facts: Although they are named starfish, they are not related to fish at all. Starfish belong to the group of marine invertebrates which also include sea cucumber, sea urchin and sand dollar. Their star-like shape is the reason why they are named starfish or sea stars. Starfish-Sea Stars Description Anatomy Most starfish or sea stars are pentamerous, having five arms that radiate from a central disk. The sea star is covered with tough skin and sharp, calcareous spines. Anatomy. Starfish-Sea Stars Habitat Habitat and Distribution Starfish or sea stars are found in most of temperate and tropical oceans of the world. They are exclusively marine and are bottom dwellers. Sea stars are found in a variety of habitats from the intertidal zone down to the bottom of deep seas but they are mainly found in shallow marine environments. They are found in sand, amongst rubble and on coral reefs and rocky bottoms below low tide as well as in estuaries and under the sand on beaches. Starfish Description. This marine creature is one that is the most recognized by people. Starfish are found in all sizes due to location. Some of them are light brown and others are golden or dark brown in color. Some also feature a reddish tone to them. They have a detailed water vascular system that enables them to get around in the water Amazing Starfish Facts For Kids. 1  The evolutionary ancestors of starfish are considered to be echinoderms and are thought to have had bilateral symmetry. 2  Modern starfish have bilateral symmetry in their larval phase. 3  Starfish have five arms and rays that spread out from a central disc. Not many sites offer these amazing starfish facts for kids including starfish habitat, diet, reproduction, and types. Through this article you’ll be raising your understanding towards this beautiful marina animal. Starfish or sea stars are echinoderms that belong to the Asteriodae class. These fish are commonly referred to as starfish. There are around 1,800 starfish species worldwide, and most of them inhabits in Pacific, Atlantic, Southern, Arctic, and Indian Oceans The starfish (commonly as a sea star) is generally found with 5 arms that are attached to a central disc. This central disc is the activity center of the starfish and also contains the mouth of the starfish. 
https://en.wikipedia.org/wiki/Starfish http://www.softschools.com/facts/animals/starfish_facts/85/ http://www.users.on.net/~jamesmosby/starfish/description.html http://www.users.on.net/~jamesmosby/starfish/habitat.html http://www.bioexpedition.com/starfish/ http://animalstime.com/starfish-facts-kids-starfish-diet-habitat/ http://a-z-animals.com/animals/starfish/
description of starfish habitat