Question

Which invertebrate phylum shows the characteristics of having spines on their endoskeleton, radial symmetry and water vascular system?

• A. Porifera (sponges)
• B. Annelida (earthworms)
• C. Arthropoda (insects, crabs and scorpions)
• D. Echinodermata (starfishes and sea urchins)
• E. Mollusca (snails and slugs)

Answer 1

Answer: (D)

Echinodermata (starfishes and sea urchins)

Echinodermata is a phylum of invertebrate marine animals. Their body is covered with calcareous scales and many projections called spines. The body can be radially divided into five parts. They have water vascular system which is known as ring canal and five radial canals which arise from the ring canal. This system is used for locomotion, transportation of food and wastes and respiration.