The phylum Echinodermata includes sea stars. They are thus related to sand dollars, sea urchins, sea cucumbers, and sea lilies. This phylum contains approximately 7,000 species in total. Many echinoderms have radial symmetry, which means that their body parts are organized around a central axis. Because their bodies are divided into five sections, many sea stars have five-point radial symmetry. This means they don't have a clear left and right half, only a top and a bottom. Spines are also common in echinoderms, though they are less prominent in sea stars than in other organisms such as sea urchins.
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