Phylum Echinodermata

Question 0

Class Crinoidea (sea lilies)

Answer 0

• long stalk attached to substrate
• feathery arms circle mouth
• primitive
• abundant in fossil record

Question 1

Class Asteroidea (starfish)

Answer 1

• Many powerful tube feet
• feed on bivalves
• often colorful
• shallow marine and coastal habitats

Question 2

Echinoidea (sea urchins, sand dollars)

Answer 2

• no arms
• spines / tube feet for locomotion
• some have poisonous spines

Question 3

Class Holothuroidea (sea cucumber)

Answer 3

• plant like
• soft leathery body
• body elongate and bilaterally symmetrical
• some with feathery tentacles
• many brightly colored