ECHINODERMATA

-sea urchins -sand dollars || -nearly all live on the sea floor || -stomach extends out of body to engulf food || -water vascular system: network of hydraulic canals, radiate from central disk radial canals connected to outside by madreporite || -sub-epidermal system of calcareous plates -movement due to tube feet || -sexual: males + females, larvae || -larvae & adults forms -larvae are bilateral, adults are radial || -one species capable of secreting venomous material || -no brain or eyes -some hasve photosensitive arms || -highly evolutionary advanced phylum || -sea urchins are eaten by scooping out of their endoskeleton ||
 * =**Phylum**= || Sam Sander ||
 * **1 Examples** || -sea stars
 * **2 Habitats** || -marine environment
 * **3 Mode of feeding, digestive, excretory** || -carnivores, tube feet allow them to pry open bivalves
 * **4 Internal Transport****(circulation & respiration)** || -poorly defined open circulatory system
 * **5 Symmetry & Support,**===Locomotion, body covering=== || -5-rayed symmetry, mostly radial, sometimes bilateral
 * **6 Fertilization &Reproduction****(sexual/ asexual)** || -asexual reproduction through regeneration
 * **7 Body Forms (life stage forms)** || -no cephalization
 * **8 Defense / senses/ response to environment** || -tiny pincers & spines protect from predators
 * **9 Nervous system** || -circum-oesophageal ring
 * **10 Importance (how it fits into****the world)** || -fossilize well -> provide a good record of their history
 * **Misc.** || -sea cucumbers are considered a delicacy in some cultures