Question

Briefly describe about the spiny skinned animals with examples.

Answer 1

Phylum Echinodermata (Spiny Skinned Animals):

• They are exclusively free-living marine animals. These are triploblastic and true coelomates with organ-system grade of organization.
• Adult animals are radially symmetrical but larvae remain bilaterally symmetrical.
• A unique feature is the presence of fluid filled water vascular system. Locomotion occurs by tube feet.
• Body wall is covered with spiny hard calcareous ossicles

Examples: Star fish, Sea urchin.