Spotlight on Howe Sound Marine Life: Radial Symmetry Animals
2,377 views · Published 9 November 2012 · 0:21 · Indexed 23 September 2026
Channel: Vancouver Aquarium · 2012 · Education
The Echinoderms are animals with radial symmetry, usually five-armed and with no left or right sides. They also have an internal hydraulic system of fluid canals that often includes many rows of conspicuous tube feet. Included are the sea stars, brittle stars, feather stars, sea urchins and sea cucumbers. Sea urchins have their radial symmetry evident on their hard, globular shell, but that shell is surrounded by moveable spines that resemble a sort of pin cushion. Sea urchins are often found eating seaweed, and some areas are called "urchin barrens" when all the seaweed has been mowed down and hordes of urchins remain. Read more on AquaBlog: http://www.aquablog.ca/2012/11/spotlight-on-howe-sound-marine-life-radial-symmetry-animals-3/
