Echinodermata

Question 1

What are the echinodermata?

Answer 1

Starfish, sea urchins, brittle stars

Question 2

What are the key characters?

Answer 2

Sessile of slow moving,
secondary radial symmetry, larva are bilateral, epidermis become endoskeleton of calcareous plates radiate from central morals, unique water vascular system

Question 3

What are the classes?

Answer 3

Asteroidea - starfish
Opicroidea - brittle stars
Echinoidea - sea urchins/sand dollars
Crinoidea - sea lollies and feather stars
Holothuroidea - sea cucumbers 
Coentrycycloides - sea daises