Echinodermata

Question 1

symmetry

Answer 1

radial -> bilateral
radial- star fish and sand dollar
bilateral- sea lily and sea cucumber

Question 2

type of body cavity

Answer 2

coelomate

Question 3

body plan

Answer 3

COMPLETE digestive system
OPEN circulatory system
respiratory system
ciliated coelom
water vascular system

Question 4

complete digestive system

Answer 4

• simple and complete
  -2 stomachs
  -anus depends

Question 5

respiratory system

Answer 5

gills
tube feet

Question 6

coelom ciliated

Answer 6

cavity with free cells (amoebocytes

Question 7

5 classes

Answer 7

1. Echinoidea- sea urchin +sand dollar
2. Crinoidea- sea lily
3. Ophiuroidea- brittle stars
4. Holothuroidea- sea cucumber
5. Asteroidea- star fish

Question 8

parts to know

Answer 8

external
internal
water vascular

Question 9

external

Answer 9

• central disk
• arms
• madreporite
• Bright color area
• Takes in water
• Anus
• Depression on central disk
• Mouth underneath, ventral side
• Ambulacral groove
  -runs down each arm
  -row of tube feet (tipped with suction cups)

Question 10

internal

Answer 10

• mouth
  -esophagus
  -cardiac stomach (part that can stick out through mouth)
  -pyloric stomach
  -rectal caeca (dorsal to pyloric stomach)
  -anus
  -digestive gland (5 @ each arm)
  -small intestine
• gonad (under digestive gland
  -ambulacral ridge
• ampulla (bulbish structure)
  -tube feet

Question 11

water vascular system

Answer 11

• madreporite
  -stone canal
• ring canal
  -radial canal (lines each arm)
  -ampulla
  -tube feet