Question

Pinnules occur over the arms of

• A. Asterias
• B. Antedon
• C. Astropecten
• D. Holothuria

Answer 1

The correct option is B Antedon

A) Asterias has hard spines.

B) Antedon has ten slender arms which are actually five in number and each arm is bifurcated at the base. Each arm has two rows of smaller branches which are feathery, called pinnules.

C) Astropectenhas hard spines.

D) Holothuria has hard spines.

So the right answer is 'Antedon'.