Question

Wheel animalcules are

• A. Coelenterates
• B. Echinoderms
• C. Rotifers
• D. Protozoans

Answer 1

The correct option is C Rotifers

• Animalcule is an older term for a microscopic animal or protozoan.
• Rotifers are microscopic and free-living or near-microscopic pseudocoelomate animals belonging to the phylum Rotifera.
• 90% of rotifers inhabit freshwater habitats but some live in brackish water and few in the ocean.
• Rotifers are called wheel animalcules because their corona is composed of several ciliated tufts around the mouth that in motion resemble a wheel.
• Hence wheel animalcules are Rotifers.

So, the correct answer is 'Rotifers'.