1. Echinodermata

2. Classification Crinoidea--stalked, with arms Asteroids Echinoidea
Regular stars
Brittle stars
Echinoidea
Holothuroidea

3. Attributes of the echinoderms
Spiny skin
Endoskeleton with calcareous elements
Pentamerous radial symmetry
Water vascular system (tube feet)
Deuterostomates
First opening becomes the anus
Coelom is formed by enterocoely
Radial cleavage, indeterministic

4. More attributes Nervous system Respiration Excretion
Nerve net-subepidermal-sensory in function
Central nervous system-motor in function
Respiration
Through their skin
Dermobranchia-may be protected by modified spines called pedicellaria
Excretion
Through the dermobranchia