Describe the general anatomy of a rotifer, explain the concept of 'eutely' in rotifers, identify the most common class of rotifers, and explain how bdelloids survive drying.

4. I cannot draw diagrams. However, a typical rotifer (e.g., Brachionus) diagram would include: • Corona: Ciliated anterior end used for feeding and locomotion. • Mouth: Located within the corona. • Mastax: Muscular pharynx containing jaws (trophi) for grinding food. • Brain: Ganglion located above the mastax. • Gastric glands: Secrete digestive enzymes. • Stomach: For digestion. • Intestine: For absorption. • Foot: Posterior appendage, often with toes and pedal glands for attachment. • Trunk: Main body section. • Germovitellarium: Produces eggs and yolk. • Bladder: Collects excretory products. • Protonephridia (flame cells): Excretory organs. 5. Rotifers exhibit eutely, meaning they have a fixed and constant number of cells from hatching. Therefore, when the animal grows, its cells do not divide to increase in number. Instead, the cells increase in size. 6. The class of rotifers that can be found in almost all freshwater environments and occasionally in brackish and marine waters is Monogononta. 7. Bdelloids are known for their remarkable ability to survive drying through a process known as cryptobiosis, specifically anhydrobiosis. Send me the next one 📸