- Has locomotion
- Has a neurological system
- Multicellular
- Heterotrophic
- Lacks a cell wall
- "Star-like" appearance
- Marine animals
- Spiny skin
- Skeleton made of calcium carbonate
- Capable of regenerating their bodies
- Has tube feet
- 5-40 arms
- Flat shape
- Primarily carnivores
- Can live up to 35 years
