Podcast
Questions and Answers
What classification does Phylum Platyhelminthes belong to?
What classification does Phylum Platyhelminthes belong to?
- Class Monogenea
- Class Trematoda
- Class Turbellaria (correct)
- Class Cestoda
What is a defining characteristic of Class Turbellaria?
What is a defining characteristic of Class Turbellaria?
Paraphyletic
What are rhabdites used for?
What are rhabdites used for?
- Gliding using cilia (correct)
- Reproduction
- Feeding
- Locomotion (correct)
All organisms in Class Turbellaria are free-living.
All organisms in Class Turbellaria are free-living.
What is the difference between endolecithal and ectolecithal egg cells?
What is the difference between endolecithal and ectolecithal egg cells?
Which of the following is NOT an example of Class Turbellaria?
Which of the following is NOT an example of Class Turbellaria?
What type of reproduction occurs in FW planarians?
What type of reproduction occurs in FW planarians?
What is a characteristic of the way sexual reproduction occurs in Class Turbellaria?
What is a characteristic of the way sexual reproduction occurs in Class Turbellaria?
Match the following examples with their characteristics:
Match the following examples with their characteristics:
Study Notes
Phylum Platyhelminthes - Class Turbellaria Overview
- Class Turbellaria is paraphyletic and has been subdivided into various classes.
- Primarily consists of free-living organisms with a simplified life cycle.
- Produces rhabdites, rod-like structures that expand in water to form a protective mucus sheath.
- Rhabdites aid in locomotion via ciliary gliding, adhesion to surfaces, and defense against predators.
Reproductive Strategies
- Demonstrates both asexual and sexual reproduction.
- Asexual reproduction occurs through fission (dividing into two) and fragmentation (regeneration from segments).
- Sexual reproduction involves lining up genital pores for sperm transfer; self-fertilization is not allowed.
- Fertilized eggs are packaged with yolk from a yolk gland, resulting in ectolecithal eggs that are attached to substrates for development.
Egg Cell Characteristics
- Endolecithal eggs contain yolk naturally, providing nutrition to the developing embryo.
- Ectolecithal eggs do not contain yolk initially; instead, yolk is added externally by glands, representing a derived trait.
Examples of Class Turbellaria
- Common examples include freshwater planarians, marine flatworms, and terrestrial planarians.
- Pink Planarian, native to Devil's Icebox cave, is a specific example of a freshwater planarian.
- Penis fencing behavior exhibited in the genus Pseudobiceros, highlighting unique reproductive strategies within Turbellaria.
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Description
Explore the fascinating world of Class Turbellaria within Phylum Platyhelminthes. This quiz covers their unique characteristics, reproductive strategies, and egg cell types. Test your knowledge on free-living organisms, their life cycles, and adaptations.
