Echinoderms
Echinoderms are a phylum of marine animals that includes sea stars, brittle stars, and sea urchins. They are characterized by their radial symmetry, coelom, and water vascular system.
Here are some of the key features of echinoderms:
- Radial symmetry
- Coelom
- Water vascular system
- Triploblastic
- Bilateral symmetry in larval form
- Internal skeleton made of calcium carbonate plates
- Simple nervous system
- No lungs
- Open circulatory system
- Complex osmoregulatory/excretory system
- Incomplete digestive system
- Can be monoecious or dioecious
- Found in a variety of habitats
- Various different lifestyles
For more information on echinoderms, please visit the following websites: