7th Grade Life Science students have been studying the phylum Echinodermata. Echinoderms are radially symmetrical animals that are only found in the sea. (None live on land or in fresh water) Radial symmetry means that the body is a hub, like a bicycle wheel, and tentacles are spokes coming out of it. Echinoderms include sea urchins, sea cucumbers, sea lilies, and sea stars. Students did a great job with their dissections and were able to view the external and internal anatomy of a sea star or starfish including their unique water vascular system.