1. Phylum Echinodermata “Spiny – skin”
Radially symmetrical (Penta - 5 parts)
Complete digestive tract, coelom, and an internal skeleton (endoskeleton)

2. Water – vascular system
Tube feet
Ampullae (muscular sac)
Madreporite (sieve plate)
Bilaterally symmetrical larvae
bipinnaria
Deuterostomes
Coelomates
Blastopore develops into anus

3. Types of Echinoderms Class Asteriodea (sea stars)
Class Ophiuroidea (brittle stars)
Class Echinoidea (sea urchins and sand dollars)
Class Holothuroidea (sea cucumbers)
Class Crinoidea (feather stars and sea lilies)

6. Biology of Echinoderms
Feeding and Digestion
Cardiac stomach (invert into prey)
Pyloric stomach (digestive glands)
Nutrients transported by coelomic fluid
Nervous system
Little known about nervous system
Reminiscent of nerve net
Nerve ring and radial nerve

8. Biology of Echinoderms
No circulatory, excretory, respiratory organ systems
Reproduction
Separate sexes
External fertilization
Regeneration