Final answer:
The 'ciliated Wheel organ' on rotifers is called the corona, which employs cilia to gather and direct food to the mouth, subsequently leading to the mastax, a structure that grinds the food.
Step-by-step explanation:
The ciliated organ on rotifers that aids in collecting food is known as the corona. Rotifers, which are microscopic and mostly aquatic organisms, use the corona to direct food toward their mouths. The movement of the cilia within the corona creates a current that helps in transporting food particles to the rotifer's mouth. After food particles enter the mouth, they travel to the mastax, which is a jaw-like muscular pharynx with teeth that grind the food before it passes to the digestive system.
In the rotifers' feeding process, cilia have a crucial role in the engulfment of food. This distinct ciliated structure at the anterior part of the rotifer resembles a wheel, hence the name "wheel-bearer" or Rotifera for the phylum. These organisms play an essential role in aquatic ecosystems as filter feeders, consuming algae, dead material, and other microscopic organisms.