╔═════════════════════╗ ★ PHYLUM :ECHINODERMATA☆ ╚═════════════════════╝ ■endoskeleton of calcareous ossicles ■All are marine ■ adult echinoderms- radially symmetrical, larvae - bilaterally symmetrical ■ presence of water vascular system ■ excretory system - absent ■ Fertilisation external, Development is indirect
EXAMPLES
☆Asterias - Star fish ☆ Echinus - Sea urchin ☆ Antedon - Sea lily ☆ Cucumaria - Sea cucumber ☆ Ophiura - Brittle star
