Phylum Echinodermata: The Spiny Skins!
Defining Characteristics
- Exclusively marine
- larvae is bipinnia
- deuterostomes
- pentaradial symmetry
- sexual reproduction and powers of regeneration
- water vascular system used for movement, feeding, and respiration
- tube feet which are used for movement and hunting
- 4 classes: Asteroidea, Echinoidea, Holothuroidea, Crinoidea
- Ampulla
- madreporite, stone canal, ring canal, radial canal
- 2 stomaches : cardiac and pyloric
- ossicles/calcarious plates
- endoskeleton
- triploblastic
- not segmented
- true coelom
- no circulatory system
- food tubes with mouth and anus