Echinodermata
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Echinodermata


Symmetry
Body Plan
Digestion
Transport within the Body
Radial
Coelemate
Closed
Complex system of tubes and cavities to help provide for nutrient transport
Gas Exchange
Method of Waste Disposal
Nervous System
Reproduction
Important Distinguishing Feature
Complex system of tubes and cavities to help provide for nutrient transport
  • Water Vascular System, or network of hydraulic canals branching into Tube Feet, which interacts directly with water environment
  • Small gills help to move gases between environment
  • Method of Waste Disposal:
  • Has an anus for excretion
  • Ameboid cells circulate in the coelomic fluid, which pick up wastes and then escape through thin walls of the skin gills where they are ejected
  • Central disk has a nerve ring and nerve cords radiate from the center
  • Eyespots are the only sensory organs, but epidermis has thousands of neurosensory cells for touch, light, and chemical reception
  • Male and female sexes release gametes into water; some can reproduce asexually by regeneration
    Water Vascular System, a network of hydraulic canals branching into Tube Feet