Echinodermata

Definition

Echinodermata is a phylum of marine animals characterized by radial symmetry, a calcareous endoskeleton, and a water vascular system. Members include starfish, sea urchins, and sand dollars.

5 Must Know Facts For Your Next Test

1. Echinoderms have a unique water vascular system used for locomotion and feeding.
2. They exhibit pentaradial symmetry as adults but have bilateral symmetry as larvae.
3. Their endoskeleton is made up of calcium carbonate plates or ossicles.
4. Echinoderms possess the ability to regenerate lost body parts.
5. Most echinoderms use tube feet for movement and capturing food.

Review Questions

• What type of symmetry do adult echinoderms exhibit?
• How do echinoderms primarily move and capture food?
• What material composes the skeleton of echinoderms?

Related terms

Radial Symmetry:

A form of symmetry where body parts are arranged around a central axis.

Water Vascular System: A network of hydraulic canals unique to echinoderms used for movement, feeding, and respiration.

Tube Feet: Small, flexible appendages used by echinoderms for locomotion and feeding.