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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.
Biology
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- 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.
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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.
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The class of rotifers that can be found in almost all freshwater environments and occasionally in brackish and marine waters is Monogononta.
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Bdelloids are known for their remarkable ability to survive drying through a process known as cryptobiosis, specifically anhydrobiosis.
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