1. Echinoderms
picture of Crinoidea, also know as a sea lilly 
Thu Truong

2. Phylum: Echinodermata
"echino" - sea urchin, "spiny"
"derm" - skin
Example animals:
Starfish
Brittle Star
Sea Urchin
Sand dollar

3. General Characteristics
Larvae - Bilateral Symmetry, cilliated, free-swimming
Adults - Pentaradial Symmetry
Endoskeleton - consists of calcium carbonate plates and spines, w/ thin cilliated epidermis
Pedicellariae - modified spines, pincer-like, keeps surface clean
Water Vascular System - network of fluid-filled canals that function in locomotion, feeding, and gas exchange.
Branches of the  WVS become extended when filled with fluid (tube feet)
Ampulla - round muscular sac at the base of the foot, stores fluid and operates tube foot
Well developed coelom, but no excretory organs.
Digestive system most prominent, simple nervous system
Sexes are separate, both eggs and sperm are released into water

4. Class: Crinoidea Anatomy Stalk - makes them sessile
"arms" resemble feather structure
Feeding/Behaviors
Remove suspended food from water
Oral surface is on upper side of disk
Tentacles coated with mucus to capture organisms

6. Class: Asteroidea Anatomy
 Central disk, has 5 to more than 20 arms - tube feet underneath
Mouth lies on underside of the disc
Endoskeleton - series of calcareous plates, enables limted movement, moves slowly
Feeding/Behaviors
Carnivorous, eats by attaching itself to prey and secretes digestive enzymes
Gas Exchange/Secretion
Poorly developed circulatory system, rely mainly on coelom and coelomic fluid
Wastes are diffused outside through the tube feet and dermal gills
Reproduction
Sexual or Asexual

8. Class: Ophiuroidea Anatomy
Bodies similar to asteroidea, but the arms are more slender, enables it to move quicker
Tube feet not used in locomotion 
Feeding/Behaviors
Tube feet used to collect and handle food

10. Class: Echinoidea Anatomy
 Have NO arms, skeletal plates are flattened into a solid shell called a test
Sand dollars have flat bodies adapted for burrowing
Sea urchins have bodies covered with spines, move by tube feet
Feeding/Behaviors
Sand dollars feed on tiny organic particles in sand
Sea urchins feed on algae on the ocean floor with calcareous teeth

13. Class: Holothuroidea Anatomy
Elongated flexible body (muscular sac), mouth surrounded by circle of tentacles (modified tube feet)
Reduction of endoskeleton to microscopic plates
Highly developed Circulatory system, transports oxygen + nutrients
Feeding/Behaviors
Slow, live on bottom floor
Eviscration - digestive tract, respiratory structures, and gonads ejected from body (unfavorable conditions)
Response to Stimuli
if irritated will attack (shoots red tubules)